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-rw-r--r--Documentation/usb/power-management.txt217
-rw-r--r--drivers/usb/core/Kconfig4
-rw-r--r--drivers/usb/core/driver.c845
-rw-r--r--drivers/usb/core/hcd.c13
-rw-r--r--drivers/usb/core/hcd.h10
-rw-r--r--drivers/usb/core/hub.c65
-rw-r--r--drivers/usb/core/message.c1
-rw-r--r--drivers/usb/core/usb.c35
-rw-r--r--drivers/usb/core/usb.h49
-rw-r--r--drivers/usb/misc/usbtest.c4
-rw-r--r--include/linux/usb.h31
11 files changed, 490 insertions, 784 deletions
diff --git a/Documentation/usb/power-management.txt b/Documentation/usb/power-management.txt
index e3fa189c257..2790ad48cfc 100644
--- a/Documentation/usb/power-management.txt
+++ b/Documentation/usb/power-management.txt
@@ -2,7 +2,7 @@
Alan Stern <stern@rowland.harvard.edu>
- November 10, 2009
+ December 11, 2009
@@ -29,9 +29,9 @@ covered to some extent (see Documentation/power/*.txt for more
information about system PM).
Note: Dynamic PM support for USB is present only if the kernel was
-built with CONFIG_USB_SUSPEND enabled. System PM support is present
-only if the kernel was built with CONFIG_SUSPEND or CONFIG_HIBERNATION
-enabled.
+built with CONFIG_USB_SUSPEND enabled (which depends on
+CONFIG_PM_RUNTIME). System PM support is present only if the kernel
+was built with CONFIG_SUSPEND or CONFIG_HIBERNATION enabled.
What is Remote Wakeup?
@@ -326,64 +326,63 @@ driver does so by calling these six functions:
void usb_autopm_get_interface_no_resume(struct usb_interface *intf);
void usb_autopm_put_interface_no_suspend(struct usb_interface *intf);
-The functions work by maintaining a counter in the usb_interface
-structure. When intf->pm_usage_count is > 0 then the interface is
-deemed to be busy, and the kernel will not autosuspend the interface's
-device. When intf->pm_usage_count is <= 0 then the interface is
-considered to be idle, and the kernel may autosuspend the device.
+The functions work by maintaining a usage counter in the
+usb_interface's embedded device structure. When the counter is > 0
+then the interface is deemed to be busy, and the kernel will not
+autosuspend the interface's device. When the usage counter is = 0
+then the interface is considered to be idle, and the kernel may
+autosuspend the device.
-(There is a similar pm_usage_count field in struct usb_device,
+(There is a similar usage counter field in struct usb_device,
associated with the device itself rather than any of its interfaces.
-This field is used only by the USB core.)
-
-Drivers must not modify intf->pm_usage_count directly; its value
-should be changed only be using the functions listed above. Drivers
-are responsible for insuring that the overall change to pm_usage_count
-during their lifetime balances out to 0 (it may be necessary for the
-disconnect method to call usb_autopm_put_interface() one or more times
-to fulfill this requirement). The first two routines use the PM mutex
-in struct usb_device for mutual exclusion; drivers using the async
-routines are responsible for their own synchronization and mutual
-exclusion.
-
- usb_autopm_get_interface() increments pm_usage_count and
- attempts an autoresume if the new value is > 0 and the
- device is suspended.
-
- usb_autopm_put_interface() decrements pm_usage_count and
- attempts an autosuspend if the new value is <= 0 and the
- device isn't suspended.
+This counter is used only by the USB core.)
+
+Drivers need not be concerned about balancing changes to the usage
+counter; the USB core will undo any remaining "get"s when a driver
+is unbound from its interface. As a corollary, drivers must not call
+any of the usb_autopm_* functions after their diconnect() routine has
+returned.
+
+Drivers using the async routines are responsible for their own
+synchronization and mutual exclusion.
+
+ usb_autopm_get_interface() increments the usage counter and
+ does an autoresume if the device is suspended. If the
+ autoresume fails, the counter is decremented back.
+
+ usb_autopm_put_interface() decrements the usage counter and
+ attempts an autosuspend if the new value is = 0.
usb_autopm_get_interface_async() and
usb_autopm_put_interface_async() do almost the same things as
- their non-async counterparts. The differences are: they do
- not acquire the PM mutex, and they use a workqueue to do their
+ their non-async counterparts. The big difference is that they
+ use a workqueue to do the resume or suspend part of their
jobs. As a result they can be called in an atomic context,
such as an URB's completion handler, but when they return the
- device will not generally not yet be in the desired state.
+ device will generally not yet be in the desired state.
usb_autopm_get_interface_no_resume() and
usb_autopm_put_interface_no_suspend() merely increment or
- decrement the pm_usage_count value; they do not attempt to
- carry out an autoresume or an autosuspend. Hence they can be
- called in an atomic context.
+ decrement the usage counter; they do not attempt to carry out
+ an autoresume or an autosuspend. Hence they can be called in
+ an atomic context.
-The conventional usage pattern is that a driver calls
+The simplest usage pattern is that a driver calls
usb_autopm_get_interface() in its open routine and
-usb_autopm_put_interface() in its close or release routine. But
-other patterns are possible.
+usb_autopm_put_interface() in its close or release routine. But other
+patterns are possible.
The autosuspend attempts mentioned above will often fail for one
reason or another. For example, the power/level attribute might be
set to "on", or another interface in the same device might not be
idle. This is perfectly normal. If the reason for failure was that
-the device hasn't been idle for long enough, a delayed workqueue
-routine is automatically set up to carry out the operation when the
-autosuspend idle-delay has expired.
+the device hasn't been idle for long enough, a timer is scheduled to
+carry out the operation automatically when the autosuspend idle-delay
+has expired.
Autoresume attempts also can fail, although failure would mean that
the device is no longer present or operating properly. Unlike
-autosuspend, there's no delay for an autoresume.
+autosuspend, there's no idle-delay for an autoresume.
Other parts of the driver interface
@@ -413,26 +412,27 @@ though, setting this flag won't cause the kernel to autoresume it.
Normally a driver would set this flag in its probe method, at which
time the device is guaranteed not to be autosuspended.)
-The synchronous usb_autopm_* routines have to run in a sleepable
-process context; they must not be called from an interrupt handler or
-while holding a spinlock. In fact, the entire autosuspend mechanism
-is not well geared toward interrupt-driven operation. However there
-is one thing a driver can do in an interrupt handler:
+If a driver does its I/O asynchronously in interrupt context, it
+should call usb_autopm_get_interface_async() before starting output and
+usb_autopm_put_interface_async() when the output queue drains. When
+it receives an input event, it should call
usb_mark_last_busy(struct usb_device *udev);
-This sets udev->last_busy to the current time. udev->last_busy is the
-field used for idle-delay calculations; updating it will cause any
-pending autosuspend to be moved back. The usb_autopm_* routines will
-also set the last_busy field to the current time.
-
-Calling urb_mark_last_busy() from within an URB completion handler is
-subject to races: The kernel may have just finished deciding the
-device has been idle for long enough but not yet gotten around to
-calling the driver's suspend method. The driver would have to be
-responsible for synchronizing its suspend method with its URB
-completion handler and causing the autosuspend to fail with -EBUSY if
-an URB had completed too recently.
+in the event handler. This sets udev->last_busy to the current time.
+udev->last_busy is the field used for idle-delay calculations;
+updating it will cause any pending autosuspend to be moved back. Most
+of the usb_autopm_* routines will also set the last_busy field to the
+current time.
+
+Asynchronous operation is always subject to races. For example, a
+driver may call one of the usb_autopm_*_interface_async() routines at
+a time when the core has just finished deciding the device has been
+idle for long enough but not yet gotten around to calling the driver's
+suspend method. The suspend method must be responsible for
+synchronizing with the output request routine and the URB completion
+handler; it should cause autosuspends to fail with -EBUSY if the
+driver needs to use the device.
External suspend calls should never be allowed to fail in this way,
only autosuspend calls. The driver can tell them apart by checking
@@ -440,75 +440,23 @@ the PM_EVENT_AUTO bit in the message.event argument to the suspend
method; this bit will be set for internal PM events (autosuspend) and
clear for external PM events.
-Many of the ingredients in the autosuspend framework are oriented
-towards interfaces: The usb_interface structure contains the
-pm_usage_cnt field, and the usb_autopm_* routines take an interface
-pointer as their argument. But somewhat confusingly, a few of the
-pieces (i.e., usb_mark_last_busy()) use the usb_device structure
-instead. Drivers need to keep this straight; they can call
-interface_to_usbdev() to find the device structure for a given
-interface.
+ Mutual exclusion
+ ----------------
- Locking requirements
- --------------------
-
-All three suspend/resume methods are always called while holding the
-usb_device's PM mutex. For external events -- but not necessarily for
-autosuspend or autoresume -- the device semaphore (udev->dev.sem) will
-also be held. This implies that external suspend/resume events are
-mutually exclusive with calls to probe, disconnect, pre_reset, and
-post_reset; the USB core guarantees that this is true of internal
-suspend/resume events as well.
+For external events -- but not necessarily for autosuspend or
+autoresume -- the device semaphore (udev->dev.sem) will be held when a
+suspend or resume method is called. This implies that external
+suspend/resume events are mutually exclusive with calls to probe,
+disconnect, pre_reset, and post_reset; the USB core guarantees that
+this is true of autosuspend/autoresume events as well.
If a driver wants to block all suspend/resume calls during some
-critical section, it can simply acquire udev->pm_mutex. Note that
-calls to resume may be triggered indirectly. Block IO due to memory
-allocations can make the vm subsystem resume a device. Thus while
-holding this lock you must not allocate memory with GFP_KERNEL or
-GFP_NOFS.
-
-Alternatively, if the critical section might call some of the
-usb_autopm_* routines, the driver can avoid deadlock by doing:
-
- down(&udev->dev.sem);
- rc = usb_autopm_get_interface(intf);
-
-and at the end of the critical section:
-
- if (!rc)
- usb_autopm_put_interface(intf);
- up(&udev->dev.sem);
-
-Holding the device semaphore will block all external PM calls, and the
-usb_autopm_get_interface() will prevent any internal PM calls, even if
-it fails. (Exercise: Why?)
-
-The rules for locking order are:
-
- Never acquire any device semaphore while holding any PM mutex.
-
- Never acquire udev->pm_mutex while holding the PM mutex for
- a device that isn't a descendant of udev.
-
-In other words, PM mutexes should only be acquired going up the device
-tree, and they should be acquired only after locking all the device
-semaphores you need to hold. These rules don't matter to drivers very
-much; they usually affect just the USB core.
-
-Still, drivers do need to be careful. For example, many drivers use a
-private mutex to synchronize their normal I/O activities with their
-disconnect method. Now if the driver supports autosuspend then it
-must call usb_autopm_put_interface() from somewhere -- maybe from its
-close method. It should make the call while holding the private mutex,
-since a driver shouldn't call any of the usb_autopm_* functions for an
-interface from which it has been unbound.
-
-But the usb_autpm_* routines always acquire the device's PM mutex, and
-consequently the locking order has to be: private mutex first, PM
-mutex second. Since the suspend method is always called with the PM
-mutex held, it mustn't try to acquire the private mutex. It has to
-synchronize with the driver's I/O activities in some other way.
+critical section, the best way is to lock the device and call
+usb_autopm_get_interface() (and do the reverse at the end of the
+critical section). Holding the device semaphore will block all
+external PM calls, and the usb_autopm_get_interface() will prevent any
+internal PM calls, even if it fails. (Exercise: Why?)
Interaction between dynamic PM and system PM
@@ -517,22 +465,11 @@ synchronize with the driver's I/O activities in some other way.
Dynamic power management and system power management can interact in
a couple of ways.
-Firstly, a device may already be manually suspended or autosuspended
-when a system suspend occurs. Since system suspends are supposed to
-be as transparent as possible, the device should remain suspended
-following the system resume. The 2.6.23 kernel obeys this principle
-for manually suspended devices but not for autosuspended devices; they
-do get resumed when the system wakes up. (Presumably they will be
-autosuspended again after their idle-delay time expires.) In later
-kernels this behavior will be fixed.
-
-(There is an exception. If a device would undergo a reset-resume
-instead of a normal resume, and the device is enabled for remote
-wakeup, then the reset-resume takes place even if the device was
-already suspended when the system suspend began. The justification is
-that a reset-resume is a kind of remote-wakeup event. Or to put it
-another way, a device which needs a reset won't be able to generate
-normal remote-wakeup signals, so it ought to be resumed immediately.)
+Firstly, a device may already be autosuspended when a system suspend
+occurs. Since system suspends are supposed to be as transparent as
+possible, the device should remain suspended following the system
+resume. But this theory may not work out well in practice; over time
+the kernel's behavior in this regard has changed.
Secondly, a dynamic power-management event may occur as a system
suspend is underway. The window for this is short, since system
diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
index ad925946f86..97a819c23ef 100644
--- a/drivers/usb/core/Kconfig
+++ b/drivers/usb/core/Kconfig
@@ -91,8 +91,8 @@ config USB_DYNAMIC_MINORS
If you are unsure about this, say N here.
config USB_SUSPEND
- bool "USB selective suspend/resume and wakeup"
- depends on USB && PM
+ bool "USB runtime power management (suspend/resume and wakeup)"
+ depends on USB && PM_RUNTIME
help
If you say Y here, you can use driver calls or the sysfs
"power/level" file to suspend or resume individual USB
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 638d54693a1..6850ec6576f 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -25,7 +25,7 @@
#include <linux/device.h>
#include <linux/usb.h>
#include <linux/usb/quirks.h>
-#include <linux/workqueue.h>
+#include <linux/pm_runtime.h>
#include "hcd.h"
#include "usb.h"
@@ -221,7 +221,7 @@ static int usb_probe_device(struct device *dev)
{
struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
struct usb_device *udev = to_usb_device(dev);
- int error = -ENODEV;
+ int error = 0;
dev_dbg(dev, "%s\n", __func__);
@@ -230,18 +230,23 @@ static int usb_probe_device(struct device *dev)
/* The device should always appear to be in use
* unless the driver suports autosuspend.
*/
- udev->pm_usage_cnt = !(udriver->supports_autosuspend);
+ if (!udriver->supports_autosuspend)
+ error = usb_autoresume_device(udev);
- error = udriver->probe(udev);
+ if (!error)
+ error = udriver->probe(udev);
return error;
}
/* called from driver core with dev locked */
static int usb_unbind_device(struct device *dev)
{
+ struct usb_device *udev = to_usb_device(dev);
struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
- udriver->disconnect(to_usb_device(dev));
+ udriver->disconnect(udev);
+ if (!udriver->supports_autosuspend)
+ usb_autosuspend_device(udev);
return 0;
}
@@ -293,17 +298,16 @@ static int usb_probe_interface(struct device *dev)
if (error)
return error;
- /* Interface "power state" doesn't correspond to any hardware
- * state whatsoever. We use it to record when it's bound to
- * a driver that may start I/0: it's not frozen/quiesced.
- */
- mark_active(intf);
intf->condition = USB_INTERFACE_BINDING;
- /* The interface should always appear to be in use
- * unless the driver suports autosuspend.
+ /* Bound interfaces are initially active. They are
+ * runtime-PM-enabled only if the driver has autosuspend support.
+ * They are sensitive to their children's power states.
*/
- atomic_set(&intf->pm_usage_cnt, !driver->supports_autosuspend);
+ pm_runtime_set_active(dev);
+ pm_suspend_ignore_children(dev, false);
+ if (driver->supports_autosuspend)
+ pm_runtime_enable(dev);
/* Carry out a deferred switch to altsetting 0 */
if (intf->needs_altsetting0) {
@@ -323,10 +327,14 @@ static int usb_probe_interface(struct device *dev)
return error;
err:
- mark_quiesced(intf);
intf->needs_remote_wakeup = 0;
intf->condition = USB_INTERFACE_UNBOUND;
usb_cancel_queued_reset(intf);
+
+ /* Unbound interfaces are always runtime-PM-disabled and -suspended */
+ pm_runtime_disable(dev);
+ pm_runtime_set_suspended(dev);
+
usb_autosuspend_device(udev);
return error;
}
@@ -376,9 +384,17 @@ static int usb_unbind_interface(struct device *dev)
usb_set_intfdata(intf, NULL);
intf->condition = USB_INTERFACE_UNBOUND;
- mark_quiesced(intf);
intf->needs_remote_wakeup = 0;
+ /* Unbound interfaces are always runtime-PM-disabled and -suspended */
+ pm_runtime_disable(dev);
+ pm_runtime_set_suspended(dev);
+
+ /* Undo any residual pm_autopm_get_interface_* calls */
+ for (r = atomic_read(&intf->pm_usage_cnt); r > 0; --r)
+ usb_autopm_put_interface_no_suspend(intf);
+ atomic_set(&intf->pm_usage_cnt, 0);
+
if (!error)
usb_autosuspend_device(udev);
@@ -409,7 +425,6 @@ int usb_driver_claim_interface(struct usb_driver *driver,
struct usb_interface *iface, void *priv)
{
struct device *dev = &iface->dev;
- struct usb_device *udev = interface_to_usbdev(iface);
int retval = 0;
if (dev->driver)
@@ -419,11 +434,16 @@ int usb_driver_claim_interface(struct usb_driver *driver,
usb_set_intfdata(iface, priv);
iface->needs_binding = 0;
- usb_pm_lock(udev);
iface->condition = USB_INTERFACE_BOUND;
- mark_active(iface);
- atomic_set(&iface->pm_usage_cnt, !driver->supports_autosuspend);
- usb_pm_unlock(udev);
+
+ /* Bound interfaces are initially active. They are
+ * runtime-PM-enabled only if the driver has autosuspend support.
+ * They are sensitive to their children's power states.
+ */
+ pm_runtime_set_active(dev);
+ pm_suspend_ignore_children(dev, false);
+ if (driver->supports_autosuspend)
+ pm_runtime_enable(dev);
/* if interface was already added, bind now; else let
* the future device_add() bind it, bypassing probe()
@@ -982,7 +1002,6 @@ static void do_unbind_rebind(struct usb_device *udev, int action)
}
}
-/* Caller has locked udev's pm_mutex */
static int usb_suspend_device(struct usb_device *udev, pm_message_t msg)
{
struct usb_device_driver *udriver;
@@ -1006,7 +1025,6 @@ static int usb_suspend_device(struct usb_device *udev, pm_message_t msg)
return status;
}
-/* Caller has locked udev's pm_mutex */
static int usb_resume_device(struct usb_device *udev, pm_message_t msg)
{
struct usb_device_driver *udriver;
@@ -1040,27 +1058,20 @@ static int usb_resume_device(struct usb_device *udev, pm_message_t msg)
return status;
}
-/* Caller has locked intf's usb_device's pm mutex */
static int usb_suspend_interface(struct usb_device *udev,
struct usb_interface *intf, pm_message_t msg)
{
struct usb_driver *driver;
int status = 0;
- /* with no hardware, USB interfaces only use FREEZE and ON states */
- if (udev->state == USB_STATE_NOTATTACHED || !is_active(intf))
- goto done;
-
- /* This can happen; see usb_driver_release_interface() */
- if (intf->condition == USB_INTERFACE_UNBOUND)
+ if (udev->state == USB_STATE_NOTATTACHED ||
+ intf->condition == USB_INTERFACE_UNBOUND)
goto done;
driver = to_usb_driver(intf->dev.driver);
if (driver->suspend) {
status = driver->suspend(intf, msg);
- if (status == 0)
- mark_quiesced(intf);
- else if (!(msg.event & PM_EVENT_AUTO))
+ if (status && !(msg.event & PM_EVENT_AUTO))
dev_err(&intf->dev, "%s error %d\n",
"suspend", status);
} else {
@@ -1068,7 +1079,6 @@ static int usb_suspend_interface(struct usb_device *udev,
intf->needs_binding = 1;
dev_warn(&intf->dev, "no %s for driver %s?\n",
"suspend", driver->name);
- mark_quiesced(intf);
}
done:
@@ -1076,14 +1086,13 @@ static int usb_suspend_interface(struct usb_device *udev,
return status;
}
-/* Caller has locked intf's usb_device's pm_mutex */
static int usb_resume_interface(struct usb_device *udev,
struct usb_interface *intf, pm_message_t msg, int reset_resume)
{
struct usb_driver *driver;
int status = 0;
- if (udev->state == USB_STATE_NOTATTACHED || is_active(intf))
+ if (udev->state == USB_STATE_NOTATTACHED)
goto done;
/* Don't let autoresume interfere with unbinding */
@@ -1134,90 +1143,11 @@ static int usb_resume_interface(struct usb_device *udev,
done:
dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status);
- if (status == 0 && intf->condition == USB_INTERFACE_BOUND)
- mark_active(intf);
/* Later we will unbind the driver and/or reprobe, if necessary */
return status;
}
-#ifdef CONFIG_USB_SUSPEND
-
-/* Internal routine to check whether we may autosuspend a device. */
-static int autosuspend_check(struct usb_device *udev, int reschedule)
-{
- int i;
- struct usb_interface *intf;
- unsigned long suspend_time, j;
-
- /* For autosuspend, fail fast if anything is in use or autosuspend
- * is disabled. Also fail if any interfaces require remote wakeup
- * but it isn't available.
- */
- if (udev->pm_usage_cnt > 0)
- return -EBUSY;
- if (udev->autosuspend_delay < 0 || udev->autosuspend_disabled)
- return -EPERM;
-
- suspend_time = udev->last_busy + udev->autosuspend_delay;
- if (udev->actconfig) {
- for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
- intf = udev->actconfig->interface[i];
- if (!is_active(intf))
- continue;
- if (atomic_read(&intf->pm_usage_cnt) > 0)
- return -EBUSY;
- if (intf->needs_remote_wakeup &&
- !udev->do_remote_wakeup) {
- dev_dbg(&udev->dev, "remote wakeup needed "
- "for autosuspend\n");
- return -EOPNOTSUPP;
- }
-
- /* Don't allow autosuspend if the device will need
- * a reset-resume and any of its interface drivers
- * doesn't include support.
- */
- if (udev->quirks & USB_QUIRK_RESET_RESUME) {
- struct usb_driver *driver;
-
- driver = to_usb_driver(intf->dev.driver);
- if (!driver->reset_resume ||
- intf->needs_remote_wakeup)
- return -EOPNOTSUPP;
- }
- }
- }
-
- /* If everything is okay but the device hasn't been idle for long
- * enough, queue a delayed autosuspend request. If the device
- * _has_ been idle for long enough and the reschedule flag is set,
- * likewise queue a delayed (1 second) autosuspend request.
- */
- j = jiffies;
- if (time_before(j, suspend_time))
- reschedule = 1;
- else
- suspend_time = j + HZ;
- if (reschedule) {
- if (!timer_pending(&udev->autosuspend.timer)) {
- queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
- round_jiffies_up_relative(suspend_time - j));
- }
- return -EAGAIN;
- }
- return 0;
-}
-
-#else
-
-static inline int autosuspend_check(struct usb_device *udev, int reschedule)
-{
- return 0;
-}
-
-#endif /* CONFIG_USB_SUSPEND */
-
/**
* usb_suspend_both - suspend a USB device and its interfaces
* @udev: the usb_device to suspend
@@ -1229,27 +1159,12 @@ static inline int autosuspend_check(struct usb_device *udev, int reschedule)
* all the interfaces which were suspended are resumed so that they remain
* in the same state as the device.
*
- * If an autosuspend is in progress the routine checks first to make sure
- * that neither the device itself or any of its active interfaces is in use
- * (pm_usage_cnt is greater than 0). If they are, the autosuspend fails.
- *
- * If the suspend succeeds, the routine recursively queues an autosuspend
- * request for @udev's parent device, thereby propagating the change up
- * the device tree. If all of the parent's children are now suspended,
- * the parent will autosuspend in turn.
- *
- * The suspend method calls are subject to mutual exclusion under control
- * of @udev's pm_mutex. Many of these calls are also under the protection
- * of @udev's device lock (including all requests originating outside the
- * USB subsystem), but autosuspend requests generated by a child device or
- * interface driver may not be. Usbcore will insure that the method calls
- * do not arrive during bind, unbind, or reset operations. However, drivers
- * must be prepared to handle suspend calls arriving at unpredictable times.
- * The only way to block such calls is to do an autoresume (preventing
- * autosuspends) while holding @udev's device lock (preventing outside
- * suspends).
- *
- * The caller must hold @udev->pm_mutex.
+ * Autosuspend requests originating from a child device or an interface
+ * driver may be made without the protection of @udev's device lock, but
+ * all other suspend calls will hold the lock. Usbcore will insure that
+ * method calls do not arrive during bind, unbind, or reset operations.
+ * However drivers must be prepared to handle suspend calls arriving at
+ * unpredictable times.
*
* This routine can run only in process context.
*/
@@ -1258,20 +1173,11 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
int status = 0;
int i = 0;
struct usb_interface *intf;
- struct usb_device *parent = udev->parent;
if (udev->state == USB_STATE_NOTATTACHED ||
udev->state == USB_STATE_SUSPENDED)
goto done;
- udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
-
- if (msg.event & PM_EVENT_AUTO) {
- status = autosuspend_check(udev, 0);
- if (status < 0)
- goto done;
- }
-
/* Suspend all the interfaces and then udev itself */
if (udev->actconfig) {
for (; i < udev->actconfig->desc.bNumInterfaces; i++) {
@@ -1286,35 +1192,21 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
/* If the suspend failed, resume interfaces that did get suspended */
if (status != 0) {
- pm_message_t msg2;
-
- msg2.event = msg.event ^ (PM_EVENT_SUSPEND | PM_EVENT_RESUME);
+ msg.event ^= (PM_EVENT_SUSPEND | PM_EVENT_RESUME);
while (--i >= 0) {
intf = udev->actconfig->interface[i];
- usb_resume_interface(udev, intf, msg2, 0);
+ usb_resume_interface(udev, intf, msg, 0);
}
- /* Try another autosuspend when the interfaces aren't busy */
- if (msg.event & PM_EVENT_AUTO)
- autosuspend_check(udev, status == -EBUSY);
-
- /* If the suspend succeeded then prevent any more URB submissions,
- * flush any outstanding URBs, and propagate the suspend up the tree.
+ /* If the suspend succeeded then prevent any more URB submissions
+ * and flush any outstanding URBs.
*/
} else {
- cancel_delayed_work(&udev->autosuspend);
udev->can_submit = 0;
for (i = 0; i < 16; ++i) {
usb_hcd_flush_endpoint(udev, udev->ep_out[i]);
usb_hcd_flush_endpoint(udev, udev->ep_in[i]);
}
-
- /* If this is just a FREEZE or a PRETHAW, udev might
- * not really be suspended. Only true suspends get
- * propagated up the device tree.
- */
- if (parent && udev->state == USB_STATE_SUSPENDED)
- usb_autosuspend_device(parent);
}
done:
@@ -1331,23 +1223,12 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
* the resume method for @udev and then calls the resume methods for all
* the interface drivers in @udev.
*
- * Before starting the resume, the routine calls itself recursively for
- * the parent device of @udev, thereby propagating the change up the device
- * tree and assuring that @udev will be able to resume. If the parent is
- * unable to resume successfully, the routine fails.
- *
- * The resume method calls are subject to mutual exclusion under control
- * of @udev's pm_mutex. Many of these calls are also under the protection
- * of @udev's device lock (including all requests originating outside the
- * USB subsystem), but autoresume requests generated by a child device or
- * interface driver may not be. Usbcore will insure that the method calls
- * do not arrive during bind, unbind, or reset operations. However, drivers
- * must be prepared to handle resume calls arriving at unpredictable times.
- * The only way to block such calls is to do an autoresume (preventing
- * other autoresumes) while holding @udev's device lock (preventing outside
- * resumes).
- *
- * The caller must hold @udev->pm_mutex.
+ * Autoresume requests originating from a child device or an interface
+ * driver may be made without the protection of @udev's device lock, but
+ * all other resume calls will hold the lock. Usbcore will insure that
+ * method calls do not arrive during bind, unbind, or reset operations.
+ * However drivers must be prepared to handle resume calls arriving at
+ * unpredictable times.
*
* This routine can run only in process context.
*/
@@ -1356,48 +1237,18 @@ static int usb_resume_both(struct usb_device *udev, pm_message_t msg)
int status = 0;
int i;
struct usb_interface *intf;
- struct usb_device *parent = udev->parent;
- cancel_delayed_work(&udev->autosuspend);
if (udev->state == USB_STATE_NOTATTACHED) {
status = -ENODEV;
goto done;
}
udev->can_submit = 1;
- /* Propagate the resume up the tree, if necessary */
- if (udev->state == USB_STATE_SUSPENDED) {
- if (parent) {
- status = usb_autoresume_device(parent);
- if (status == 0) {
- status = usb_resume_device(udev, msg);
- if (status || udev->state ==
- USB_STATE_NOTATTACHED) {
- usb_autosuspend_device(parent);
-
- /* It's possible usb_resume_device()
- * failed after the port was
- * unsuspended, causing udev to be
- * logically disconnected. We don't
- * want usb_disconnect() to autosuspend
- * the parent again, so tell it that
- * udev disconnected while still
- * suspended. */
- if (udev->state ==
- USB_STATE_NOTATTACHED)
- udev->discon_suspended = 1;
- }
- }
- } else {
-
- /* We can't progagate beyond the USB subsystem,
- * so if a root hub's controller is suspended
- * then we're stuck. */
- status = usb_resume_device(udev, msg);
- }
- } else if (udev->reset_resume)
+ /* Resume the device */
+ if (udev->state == USB_STATE_SUSPENDED || udev->reset_resume)
status = usb_resume_device(udev, msg);
+ /* Resume the interfaces */
if (status == 0 && udev->actconfig) {
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
intf = udev->actconfig->interface[i];
@@ -1413,104 +1264,46 @@ static int usb_resume_both(struct usb_device *udev, pm_message_t msg)
return status;
}
-/**
- * usb_external_suspend_device - external suspend of a USB device and its interfaces
- * @udev: the usb_device to suspend
- * @msg: Power Management message describing this state transition
- *
- * This routine handles external suspend requests: ones not generated
- * internally by a USB driver (autosuspend) but rather coming from the user
- * (via sysfs) or the PM core (system sleep). The suspend will be carried
- * out regardless of @udev's usage counter or those of its interfaces,
- * and regardless of whether or not remote wakeup is enabled. Of course,
- * interface drivers still have the option of failing the suspend (if
- * there are unsuspended children, for example).
- *
- * The caller must hold @udev's device lock.
- */
-int usb_external_suspend_device(struct usb_device *udev, pm_message_t msg)
-{
- int status;
-
- do_unbind_rebind(udev, DO_UNBIND);
- usb_pm_lock(udev);
- status = usb_suspend_both(udev, msg);
- usb_pm_unlock(udev);
- return status;
-}
-
-/**
- * usb_external_resume_device - external resume of a USB device and its interfaces
- * @udev: the usb_device to resume
- * @msg: Power Management message describing this state transition
- *
- * This routine handles external resume requests: ones not generated
- * internally by a USB driver (autoresume) but rather coming from the user
- * (via sysfs), the PM core (system resume), or the device itself (remote
- * wakeup). @udev's usage counter is unaffected.
- *
- * The caller must hold @udev's device lock.
- */
-int usb_external_resume_device(struct usb_device *udev, pm_message_t msg)
-{
- int status;
-
- usb_pm_lock(udev);
- status = usb_resume_both(udev, msg);
- udev->last_busy = jiffies;
- usb_pm_unlock(udev);
- if (status == 0)
- do_unbind_rebind(udev, DO_REBIND);
-
- /* Now that the device is awake, we can start trying to autosuspend
- * it again. */
- if (status == 0)
- usb_try_autosuspend_device(udev);
- return status;
-}
-
+/* The device lock is held by the PM core */
int usb_suspend(struct device *dev, pm_message_t msg)
{
- struct usb_device *udev;
-
- udev = to_usb_device(dev);
+ struct usb_device *udev = to_usb_device(dev);
- /* If udev is already suspended, we can skip this suspend and
- * we should also skip the upcoming system resume. High-speed
- * root hubs are an exception; they need to resume whenever the
- * system wakes up in order for USB-PERSIST port handover to work
- * properly.
- */
- if (udev->state == USB_STATE_SUSPENDED) {
- if (udev->parent || udev->speed != USB_SPEED_HIGH)
- udev->skip_sys_resume = 1;
- return 0;
- }
-
- udev->skip_sys_resume = 0;
- return usb_external_suspend_device(udev, msg);
+ do_unbind_rebind(udev, DO_UNBIND);
+ udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
+ return usb_suspend_both(udev, msg);
}
+/* The device lock is held by the PM core */
int usb_resume(struct device *dev, pm_message_t msg)
{
- struct usb_device *udev;
+ struct usb_device *udev = to_usb_device(dev);
int status;
- udev = to_usb_device(dev);
+ /* For PM complete calls, all we do is rebind interfaces */
+ if (msg.event == PM_EVENT_ON) {
+ if (udev->state != USB_STATE_NOTATTACHED)
+ do_unbind_rebind(udev, DO_REBIND);
+ status = 0;
- /* If udev->skip_sys_resume is set then udev was already suspended
- * when the system sleep started, so we don't want to resume it
- * during this system wakeup.
+ /* For all other calls, take the device back to full power and
+ * tell the PM core in case it was autosuspended previously.
*/
- if (udev->skip_sys_resume)
- return 0;
- status = usb_external_resume_device(udev, msg);
+ } else {
+ status = usb_resume_both(udev, msg);
+ if (status == 0) {
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ udev->last_busy = jiffies;
+ }
+ }
/* Avoid PM error messages for devices disconnected while suspended
* as we'll display regular disconnect messages just a bit later.
*/
if (status == -ENODEV)
- return 0;
+ status = 0;
return status;
}
@@ -1560,54 +1353,6 @@ int usb_disable_autosuspend(struct usb_device *udev)
}
EXPORT_SYMBOL_GPL(usb_disable_autosuspend);
-/* Internal routine to adjust a device's usage counter and change
- * its autosuspend state.
- */
-static int usb_autopm_do_device(struct usb_device *udev, int inc_usage_cnt)
-{
- int status = 0;
-
- usb_pm_lock(udev);
- udev->pm_usage_cnt += inc_usage_cnt;
- WARN_ON(udev->pm_usage_cnt < 0);
- if (inc_usage_cnt)
- udev->last_busy = jiffies;
- if (inc_usage_cnt >= 0 && udev->pm_usage_cnt > 0) {
- if (udev->state == USB_STATE_SUSPENDED)
- status = usb_resume_both(udev, PMSG_AUTO_RESUME);
- if (status != 0)
- udev->pm_usage_cnt -= inc_usage_cnt;
- else if (inc_usage_cnt)
- udev->last_busy = jiffies;
- } else if (inc_usage_cnt <= 0 && udev->pm_usage_cnt <= 0) {
- status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
- }
- usb_pm_unlock(udev);
- return status;
-}
-
-/* usb_autosuspend_work - callback routine to autosuspend a USB device */
-void usb_autosuspend_work(struct work_struct *work)
-{
- struct usb_device *udev =
- container_of(work, struct usb_device, autosuspend.work);
-
- usb_autopm_do_device(udev, 0);
-}
-
-/* usb_autoresume_work - callback routine to autoresume a USB device */
-void usb_autoresume_work(struct work_struct *work)
-{
- struct usb_device *udev =
- container_of(work, struct usb_device, autoresume);
-
- /* Wake it up, let the drivers do their thing, and then put it
- * back to sleep.
- */
- if (usb_autopm_do_device(udev, 1) == 0)
- usb_autopm_do_device(udev, -1);
-}
-
/**
* usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces
* @udev: the usb_device to autosuspend
@@ -1616,12 +1361,9 @@ void usb_autoresume_work(struct work_struct *work)
* @udev and wants to allow it to autosuspend. Examples would be when
* @udev's device file in usbfs is closed or after a configuration change.
*
- * @udev's usage counter is decremented. If it or any of the usage counters
- * for an active interface is greater than 0, no autosuspend request will be
- * queued. (If an interface driver does not support autosuspend then its
- * usage counter is permanently positive.) Furthermore, if an interface
- * driver requires remote-wakeup capability during autosuspend but remote
- * wakeup is disabled, the autosuspend will fail.
+ * @udev's usage counter is decremented; if it drops to 0 and all the
+ * interfaces are inactive then a delayed autosuspend will be attempted.
+ * The attempt may fail (see autosuspend_check()).
*
* The caller must hold @udev's device lock.
*
@@ -1631,9 +1373,11 @@ void usb_autosuspend_device(struct usb_device *udev)
{
int status;
- status = usb_autopm_do_device(udev, -1);
- dev_vdbg(&udev->dev, "%s: cnt %d\n",
- __func__, udev->pm_usage_cnt);
+ udev->last_busy = jiffies;
+ status = pm_runtime_put_sync(&udev->dev);
+ dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n",
+ __func__, atomic_read(&udev->dev.power.usage_count),
+ status);
}
/**
@@ -1643,9 +1387,9 @@ void usb_autosuspend_device(struct usb_device *udev)
* This routine should be called when a core subsystem thinks @udev may
* be ready to autosuspend.
*
- * @udev's usage counter left unchanged. If it or any of the usage counters
- * for an active interface is greater than 0, or autosuspend is not allowed
- * for any other reason, no autosuspend request will be queued.
+ * @udev's usage counter left unchanged. If it is 0 and all the interfaces
+ * are inactive then an autosuspend will be attempted. The attempt may
+ * fail or be delayed.
*
* The caller must hold @udev's device lock.
*
@@ -1653,9 +1397,12 @@ void usb_autosuspend_device(struct usb_device *udev)
*/
void usb_try_autosuspend_device(struct usb_device *udev)
{
- usb_autopm_do_device(udev, 0);
- dev_vdbg(&udev->dev, "%s: cnt %d\n",
- __func__, udev->pm_usage_cnt);
+ int status;
+
+ status = pm_runtime_idle(&udev->dev);
+ dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n",
+ __func__, atomic_read(&udev->dev.power.usage_count),
+ status);
}
/**
@@ -1664,9 +1411,9 @@ void usb_try_autosuspend_device(struct usb_device *udev)
*
* This routine should be called when a core subsystem wants to use @udev
* and needs to guarantee that it is not suspended. No autosuspend will
- * occur until usb_autosuspend_device is called. (Note that this will not
- * prevent suspend events originating in the PM core.) Examples would be
- * when @udev's device file in usbfs is opened or when a remote-wakeup
+ * occur until usb_autosuspend_device() is called. (Note that this will
+ * not prevent suspend events originating in the PM core.) Examples would
+ * be when @udev's device file in usbfs is opened or when a remote-wakeup
* request is received.
*
* @udev's usage counter is incremented to prevent subsequent autosuspends.
@@ -1680,42 +1427,14 @@ int usb_autoresume_device(struct usb_device *udev)
{
int status;
- status = usb_autopm_do_device(udev, 1);
- dev_vdbg(&udev->dev, "%s: status %d cnt %d\n",
- __func__, status, udev->pm_usage_cnt);
- return status;
-}
-
-/* Internal routine to adjust an interface's usage counter and change
- * its device's autosuspend state.
- */
-static int usb_autopm_do_interface(struct usb_interface *intf,
- int inc_usage_cnt)
-{
- struct usb_device *udev = interface_to_usbdev(intf);
- int status = 0;
-
- usb_pm_lock(udev);
- if (intf->condition == USB_INTERFACE_UNBOUND)
- status = -ENODEV;
- else {
- atomic_add(inc_usage_cnt, &intf->pm_usage_cnt);
- udev->last_busy = jiffies;
- if (inc_usage_cnt >= 0 &&
- atomic_read(&intf->pm_usage_cnt) > 0) {
- if (udev->state == USB_STATE_SUSPENDED)
- status = usb_resume_both(udev,
- PMSG_AUTO_RESUME);
- if (status != 0)
- atomic_sub(inc_usage_cnt, &intf->pm_usage_cnt);
- else
- udev->last_busy = jiffies;
- } else if (inc_usage_cnt <= 0 &&
- atomic_read(&intf->pm_usage_cnt) <= 0) {
- status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
- }
- }
- usb_pm_unlock(udev);
+ status = pm_runtime_get_sync(&udev->dev);
+ if (status < 0)
+ pm_runtime_put_sync(&udev->dev);
+ dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n",
+ __func__, atomic_read(&udev->dev.power.usage_count),
+ status);
+ if (status > 0)
+ status = 0;
return status;
}
@@ -1729,34 +1448,25 @@ static int usb_autopm_do_interface(struct usb_interface *intf,
* closed.
*
* The routine decrements @intf's usage counter. When the counter reaches
- * 0, a delayed autosuspend request for @intf's device is queued. When
- * the delay expires, if @intf->pm_usage_cnt is still <= 0 along with all
- * the other usage counters for the sibling interfaces and @intf's
- * usb_device, the device and all its interfaces will be autosuspended.
- *
- * Note that @intf->pm_usage_cnt is owned by the interface driver. The
- * core will not change its value other than the increment and decrement
- * in usb_autopm_get_interface and usb_autopm_put_interface. The driver
- * may use this simple counter-oriented discipline or may set the value
- * any way it likes.
+ * 0, a delayed autosuspend request for @intf's device is attempted. The
+ * attempt may fail (see autosuspend_check()).
*
* If the driver has set @intf->needs_remote_wakeup then autosuspend will
* take place only if the device's remote-wakeup facility is enabled.
*
- * Suspend method calls queued by this routine can arrive at any time
- * while @intf is resumed and its usage counter is equal to 0. They are
- * not protected by the usb_device's lock but only by its pm_mutex.
- * Drivers must provide their own synchronization.
- *
* This routine can run only in process context.
*/
void usb_autopm_put_interface(struct usb_interface *intf)
{
- int status;
+ struct usb_device *udev = interface_to_usbdev(intf);
+ int status;
- status = usb_autopm_do_interface(intf, -1);
- dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
- __func__, status, atomic_read(&intf->pm_usage_cnt));
+ udev->last_busy = jiffies;
+ atomic_dec(&intf->pm_usage_cnt);
+ status = pm_runtime_put_sync(&intf->dev);
+ dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
+ __func__, atomic_read(&intf->dev.power.usage_count),
+ status);
}
EXPORT_SYMBOL_GPL(usb_autopm_put_interface);
@@ -1764,11 +1474,11 @@ EXPORT_SYMBOL_GPL(usb_autopm_put_interface);
* usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter
* @intf: the usb_interface whose counter should be decremented
*
- * This routine does essentially the same thing as
- * usb_autopm_put_interface(): it decrements @intf's usage counter and
- * queues a delayed autosuspend request if the counter is <= 0. The
- * difference is that it does not acquire the device's pm_mutex;
- * callers must handle all synchronization issues themselves.
+ * This routine does much the same thing as usb_autopm_put_interface():
+ * It decrements @intf's usage counter and schedules a delayed
+ * autosuspend request if the counter is <= 0. The difference is that it
+ * does not perform any synchronization; callers should hold a private
+ * lock and handle all synchronization issues themselves.
*
* Typically a driver would call this routine during an URB's completion
* handler, if no more URBs were pending.
@@ -1778,28 +1488,58 @@ EXPORT_SYMBOL_GPL(usb_autopm_put_interface);
void usb_autopm_put_interface_async(struct usb_interface *intf)
{
struct usb_device *udev = interface_to_usbdev(intf);
+ unsigned long last_busy;
int status = 0;
- if (intf->condition == USB_INTERFACE_UNBOUND) {
- status = -ENODEV;
- } else {
- udev->last_busy = jiffies;
- atomic_dec(&intf->pm_usage_cnt);
- if (udev->autosuspend_disabled || udev->autosuspend_delay < 0)
- status = -EPERM;
- else if (atomic_read(&intf->pm_usage_cnt) <= 0 &&
- !timer_pending(&udev->autosuspend.timer)) {
- queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
+ last_busy = udev->last_busy;
+ udev->last_busy = jiffies;
+ atomic_dec(&intf->pm_usage_cnt);
+ pm_runtime_put_noidle(&intf->dev);
+
+ if (!udev->autosuspend_disabled) {
+ /* Optimization: Don't schedule a delayed autosuspend if
+ * the timer is already running and the expiration time
+ * wouldn't change.
+ *
+ * We have to use the interface's timer. Attempts to
+ * schedule a suspend for the device would fail because
+ * the interface is still active.
+ */
+ if (intf->dev.power.timer_expires == 0 ||
+ round_jiffies_up(last_busy) !=
+ round_jiffies_up(jiffies)) {
+ status = pm_schedule_suspend(&intf->dev,
+ jiffies_to_msecs(
round_jiffies_up_relative(
- udev->autosuspend_delay));
+ udev->autosuspend_delay)));
}
}
- dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
- __func__, status, atomic_read(&intf->pm_usage_cnt));
+ dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
+ __func__, atomic_read(&intf->dev.power.usage_count),
+ status);
}
EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async);
/**
+ * usb_autopm_put_interface_no_suspend - decrement a USB interface's PM-usage counter
+ * @intf: the usb_interface whose counter should be decremented
+ *
+ * This routine decrements @intf's usage counter but does not carry out an
+ * autosuspend.
+ *
+ * This routine can run in atomic context.
+ */
+void usb_autopm_put_interface_no_suspend(struct usb_interface *intf)
+{
+ struct usb_device *udev = interface_to_usbdev(intf);
+
+ udev->last_busy = jiffies;
+ atomic_dec(&intf->pm_usage_cnt);
+ pm_runtime_put_noidle(&intf->dev);
+}
+EXPORT_SYMBOL_GPL(usb_autopm_put_interface_no_suspend);
+
+/**
* usb_autopm_get_interface - increment a USB interface's PM-usage counter
* @intf: the usb_interface whose counter should be incremented
*
@@ -1811,25 +1551,8 @@ EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async);
* or @intf is unbound. A typical example would be a character-device
* driver when its device file is opened.
*
- *
- * The routine increments @intf's usage counter. (However if the
- * autoresume fails then the counter is re-decremented.) So long as the
- * counter is greater than 0, autosuspend will not be allowed for @intf
- * or its usb_device. When the driver is finished using @intf it should
- * call usb_autopm_put_interface() to decrement the usage counter and
- * queue a delayed autosuspend request (if the counter is <= 0).
- *
- *
- * Note that @intf->pm_usage_cnt is owned by the interface driver. The
- * core will not change its value other than the increment and decrement
- * in usb_autopm_get_interface and usb_autopm_put_interface. The driver
- * may use this simple counter-oriented discipline or may set the value
- * any way it likes.
- *
- * Resume method calls generated by this routine can arrive at any time
- * while @intf is suspended. They are not protected by the usb_device's
- * lock but only by its pm_mutex. Drivers must provide their own
- * synchronization.
+ * @intf's usage counter is incremented to prevent subsequent autosuspends.
+ * However if the autoresume fails then the counter is re-decremented.
*
* This routine can run only in process context.
*/
@@ -1837,9 +1560,16 @@ int usb_autopm_get_interface(struct usb_interface *intf)
{
int status;
- status = usb_autopm_do_interface(intf, 1);
- dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
- __func__, status, atomic_read(&intf->pm_usage_cnt));
+ status = pm_runtime_get_sync(&intf->dev);
+ if (status < 0)
+ pm_runtime_put_sync(&intf->dev);
+ else
+ atomic_inc(&intf->pm_usage_cnt);
+ dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
+ __func__, atomic_read(&intf->dev.power.usage_count),
+ status);
+ if (status > 0)
+ status = 0;
return status;
}
EXPORT_SYMBOL_GPL(usb_autopm_get_interface);
@@ -1849,41 +1579,201 @@ EXPORT_SYMBOL_GPL(usb_autopm_get_interface);
* @intf: the usb_interface whose counter should be incremented
*
* This routine does much the same thing as
- * usb_autopm_get_interface(): it increments @intf's usage counter and
- * queues an autoresume request if the result is > 0. The differences
- * are that it does not acquire the device's pm_mutex (callers must
- * handle all synchronization issues themselves), and it does not
- * autoresume the device directly (it only queues a request). After a
- * successful call, the device will generally not yet be resumed.
+ * usb_autopm_get_interface(): It increments @intf's usage counter and
+ * queues an autoresume request if the device is suspended. The
+ * differences are that it does not perform any synchronization (callers
+ * should hold a private lock and handle all synchronization issues
+ * themselves), and it does not autoresume the device directly (it only
+ * queues a request). After a successful call, the device may not yet be
+ * resumed.
*
* This routine can run in atomic context.
*/
int usb_autopm_get_interface_async(struct usb_interface *intf)
{
- struct usb_device *udev = interface_to_usbdev(intf);
- int status = 0;
+ int status = 0;
+ enum rpm_status s;
- if (intf->condition == USB_INTERFACE_UNBOUND)
- status = -ENODEV;
- else {
+ /* Don't request a resume unless the interface is already suspending
+ * or suspended. Doing so would force a running suspend timer to be
+ * cancelled.
+ */
+ pm_runtime_get_noresume(&intf->dev);
+ s = ACCESS_ONCE(intf->dev.power.runtime_status);
+ if (s == RPM_SUSPENDING || s == RPM_SUSPENDED)
+ status = pm_request_resume(&intf->dev);
+
+ if (status < 0 && status != -EINPROGRESS)
+ pm_runtime_put_noidle(&intf->dev);
+ else
atomic_inc(&intf->pm_usage_cnt);
- if (atomic_read(&intf->pm_usage_cnt) > 0 &&
- udev->state == USB_STATE_SUSPENDED)
- queue_work(ksuspend_usb_wq, &udev->autoresume);
- }
- dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
- __func__, status, atomic_read(&intf->pm_usage_cnt));
+ dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
+ __func__, atomic_read(&intf->dev.power.usage_count),
+ status);
+ if (status > 0)
+ status = 0;
return status;
}
EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async);
-#else
+/**
+ * usb_autopm_get_interface_no_resume - increment a USB interface's PM-usage counter
+ * @intf: the usb_interface whose counter should be incremented
+ *
+ * This routine increments @intf's usage counter but does not carry out an
+ * autoresume.
+ *
+ * This routine can run in atomic context.
+ */
+void usb_autopm_get_interface_no_resume(struct usb_interface *intf)
+{
+ struct usb_device *udev = interface_to_usbdev(intf);
+
+ udev->last_busy = jiffies;
+ atomic_inc(&intf->pm_usage_cnt);
+ pm_runtime_get_noresume(&intf->dev);
+}
+EXPORT_SYMBOL_GPL(usb_autopm_get_interface_no_resume);
+
+/* Internal routine to check whether we may autosuspend a device. */
+static int autosuspend_check(struct usb_device *udev)
+{
+ int i;
+ struct usb_interface *intf;
+ unsigned long suspend_time, j;
+
+ /* Fail if autosuspend is disabled, or any interfaces are in use, or
+ * any interface drivers require remote wakeup but it isn't available.
+ */
+ udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
+ if (udev->actconfig) {
+ for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
+ intf = udev->actconfig->interface[i];
+
+ /* We don't need to check interfaces that are
+ * disabled for runtime PM. Either they are unbound
+ * or else their drivers don't support autosuspend
+ * and so they are permanently active.
+ */
+ if (intf->dev.power.disable_depth)
+ continue;
+ if (atomic_read(&intf->dev.power.usage_count) > 0)
+ return -EBUSY;
+ if (intf->needs_remote_wakeup &&
+ !udev->do_remote_wakeup) {
+ dev_dbg(&udev->dev, "remote wakeup needed "
+ "for autosuspend\n");
+ return -EOPNOTSUPP;
+ }
+
+ /* Don't allow autosuspend if the device will need
+ * a reset-resume and any of its interface drivers
+ * doesn't include support or needs remote wakeup.
+ */
+ if (udev->quirks & USB_QUIRK_RESET_RESUME) {
+ struct usb_driver *driver;
+
+ driver = to_usb_driver(intf->dev.driver);
+ if (!driver->reset_resume ||
+ intf->needs_remote_wakeup)
+ return -EOPNOTSUPP;
+ }
+ }
+ }
+
+ /* If everything is okay but the device hasn't been idle for long
+ * enough, queue a delayed autosuspend request.
+ */
+ j = ACCESS_ONCE(jiffies);
+ suspend_time = udev->last_busy + udev->autosuspend_delay;
+ if (time_before(j, suspend_time)) {
+ pm_schedule_suspend(&udev->dev, jiffies_to_msecs(
+ round_jiffies_up_relative(suspend_time - j)));
+ return -EAGAIN;
+ }
+ return 0;
+}
+
+static int usb_runtime_suspend(struct device *dev)
+{
+ int status = 0;
-void usb_autosuspend_work(struct work_struct *work)
-{}
+ /* A USB device can be suspended if it passes the various autosuspend
+ * checks. Runtime suspend for a USB device means suspending all the
+ * interfaces and then the device itself.
+ */
+ if (is_usb_device(dev)) {
+ struct usb_device *udev = to_usb_device(dev);
+
+ if (autosuspend_check(udev) != 0)
+ return -EAGAIN;
+
+ status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
+
+ /* If an interface fails the suspend, adjust the last_busy
+ * time so that we don't get another suspend attempt right
+ * away.
+ */
+ if (status) {
+ udev->last_busy = jiffies +
+ (udev->autosuspend_delay == 0 ?
+ HZ/2 : 0);
+ }
+
+ /* Prevent the parent from suspending immediately after */
+ else if (udev->parent) {
+ udev->parent->last_busy = jiffies;
+ }
+ }
+
+ /* Runtime suspend for a USB interface doesn't mean anything. */
+ return status;
+}
+
+static int usb_runtime_resume(struct device *dev)
+{
+ /* Runtime resume for a USB device means resuming both the device
+ * and all its interfaces.
+ */
+ if (is_usb_device(dev)) {
+ struct usb_device *udev = to_usb_device(dev);
+ int status;
+
+ status = usb_resume_both(udev, PMSG_AUTO_RESUME);
+ udev->last_busy = jiffies;
+ return status;
+ }
+
+ /* Runtime resume for a USB interface doesn't mean anything. */
+ return 0;
+}
+
+static int usb_runtime_idle(struct device *dev)
+{
+ /* An idle USB device can be suspended if it passes the various
+ * autosuspend checks. An idle interface can be suspended at
+ * any time.
+ */
+ if (is_usb_device(dev)) {
+ struct usb_device *udev = to_usb_device(dev);
+
+ if (autosuspend_check(udev) != 0)
+ return 0;
+ }
+
+ pm_runtime_suspend(dev);
+ return 0;
+}
+
+static struct dev_pm_ops usb_bus_pm_ops = {
+ .runtime_suspend = usb_runtime_suspend,
+ .runtime_resume = usb_runtime_resume,
+ .runtime_idle = usb_runtime_idle,
+};
+
+#else
-void usb_autoresume_work(struct work_struct *work)
-{}
+#define usb_bus_pm_ops (*(struct dev_pm_ops *) NULL)
#endif /* CONFIG_USB_SUSPEND */
@@ -1891,4 +1781,5 @@ struct bus_type usb_bus_type = {
.name = "usb",
.match = usb_device_match,
.uevent = usb_uevent,
+ .pm = &usb_bus_pm_ops,
};
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index fc4290b6691..b07ba051118 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -39,6 +39,7 @@
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
+#include <linux/pm_runtime.h>
#include <linux/usb.h>
@@ -1858,6 +1859,10 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
return status;
}
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_USB_SUSPEND
+
/* Workqueue routine for root-hub remote wakeup */
static void hcd_resume_work(struct work_struct *work)
{
@@ -1884,12 +1889,12 @@ void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
spin_lock_irqsave (&hcd_root_hub_lock, flags);
if (hcd->rh_registered)
- queue_work(ksuspend_usb_wq, &hcd->wakeup_work);
+ queue_work(pm_wq, &hcd->wakeup_work);
spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
}
EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
-#endif
+#endif /* CONFIG_USB_SUSPEND */
/*-------------------------------------------------------------------------*/
@@ -2034,7 +2039,7 @@ struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
init_timer(&hcd->rh_timer);
hcd->rh_timer.function = rh_timer_func;
hcd->rh_timer.data = (unsigned long) hcd;
-#ifdef CONFIG_PM
+#ifdef CONFIG_USB_SUSPEND
INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
#endif
mutex_init(&hcd->bandwidth_mutex);
@@ -2234,7 +2239,7 @@ void usb_remove_hcd(struct usb_hcd *hcd)
hcd->rh_registered = 0;
spin_unlock_irq (&hcd_root_hub_lock);
-#ifdef CONFIG_PM
+#ifdef CONFIG_USB_SUSPEND
cancel_work_sync(&hcd->wakeup_work);
#endif
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index 70a7e490f81..8953ded6954 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -80,7 +80,7 @@ struct usb_hcd {
struct timer_list rh_timer; /* drives root-hub polling */
struct urb *status_urb; /* the current status urb */
-#ifdef CONFIG_PM
+#ifdef CONFIG_USB_SUSPEND
struct work_struct wakeup_work; /* for remote wakeup */
#endif
@@ -464,16 +464,20 @@ extern int usb_find_interface_driver(struct usb_device *dev,
#define usb_endpoint_out(ep_dir) (!((ep_dir) & USB_DIR_IN))
#ifdef CONFIG_PM
-extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
extern void usb_root_hub_lost_power(struct usb_device *rhdev);
extern int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg);
extern int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg);
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_USB_SUSPEND
+extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
#else
static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
{
return;
}
-#endif /* CONFIG_PM */
+#endif /* CONFIG_USB_SUSPEND */
+
/*
* USB device fs stuff
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 746f26f222a..0e0a190bbd0 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -22,6 +22,7 @@
#include <linux/kthread.h>
#include <linux/mutex.h>
#include <linux/freezer.h>
+#include <linux/pm_runtime.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
@@ -71,7 +72,6 @@ struct usb_hub {
unsigned mA_per_port; /* current for each child */
- unsigned init_done:1;
unsigned limited_power:1;
unsigned quiescing:1;
unsigned disconnected:1;
@@ -820,7 +820,6 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
}
init3:
hub->quiescing = 0;
- hub->init_done = 1;
status = usb_submit_urb(hub->urb, GFP_NOIO);
if (status < 0)
@@ -861,11 +860,6 @@ static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
int i;
cancel_delayed_work_sync(&hub->init_work);
- if (!hub->init_done) {
- hub->init_done = 1;
- usb_autopm_put_interface_no_suspend(
- to_usb_interface(hub->intfdev));
- }
/* khubd and related activity won't re-trigger */
hub->quiescing = 1;
@@ -1405,10 +1399,8 @@ static void recursively_mark_NOTATTACHED(struct usb_device *udev)
if (udev->children[i])
recursively_mark_NOTATTACHED(udev->children[i]);
}
- if (udev->state == USB_STATE_SUSPENDED) {
- udev->discon_suspended = 1;
+ if (udev->state == USB_STATE_SUSPENDED)
udev->active_duration -= jiffies;
- }
udev->state = USB_STATE_NOTATTACHED;
}
@@ -1532,31 +1524,6 @@ static void update_address(struct usb_device *udev, int devnum)
udev->devnum = devnum;
}
-#ifdef CONFIG_USB_SUSPEND
-
-static void usb_stop_pm(struct usb_device *udev)
-{
- /* Synchronize with the ksuspend thread to prevent any more
- * autosuspend requests from being submitted, and decrement
- * the parent's count of unsuspended children.
- */
- usb_pm_lock(udev);
- if (udev->parent && !udev->discon_suspended)
- usb_autosuspend_device(udev->parent);
- usb_pm_unlock(udev);
-
- /* Stop any autosuspend or autoresume requests already submitted */
- cancel_delayed_work_sync(&udev->autosuspend);
- cancel_work_sync(&udev->autoresume);
-}
-
-#else
-
-static inline void usb_stop_pm(struct usb_device *udev)
-{ }
-
-#endif
-
/**
* usb_disconnect - disconnect a device (usbcore-internal)
* @pdev: pointer to device being disconnected
@@ -1625,8 +1592,6 @@ void usb_disconnect(struct usb_device **pdev)
*pdev = NULL;
spin_unlock_irq(&device_state_lock);
- usb_stop_pm(udev);
-
put_device(&udev->dev);
}
@@ -1803,9 +1768,6 @@ int usb_new_device(struct usb_device *udev)
int err;
if (udev->parent) {
- /* Increment the parent's count of unsuspended children */
- usb_autoresume_device(udev->parent);
-
/* Initialize non-root-hub device wakeup to disabled;
* device (un)configuration controls wakeup capable
* sysfs power/wakeup controls wakeup enabled/disabled
@@ -1814,6 +1776,10 @@ int usb_new_device(struct usb_device *udev)
device_set_wakeup_enable(&udev->dev, 1);
}
+ /* Tell the runtime-PM framework the device is active */
+ pm_runtime_set_active(&udev->dev);
+ pm_runtime_enable(&udev->dev);
+
usb_detect_quirks(udev);
err = usb_enumerate_device(udev); /* Read descriptors */
if (err < 0)
@@ -1844,7 +1810,8 @@ int usb_new_device(struct usb_device *udev)
fail:
usb_set_device_state(udev, USB_STATE_NOTATTACHED);
- usb_stop_pm(udev);
+ pm_runtime_disable(&udev->dev);
+ pm_runtime_set_suspended(&udev->dev);
return err;
}
@@ -2408,8 +2375,11 @@ int usb_remote_wakeup(struct usb_device *udev)
if (udev->state == USB_STATE_SUSPENDED) {
dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
- usb_mark_last_busy(udev);
- status = usb_external_resume_device(udev, PMSG_REMOTE_RESUME);
+ status = usb_autoresume_device(udev);
+ if (status == 0) {
+ /* Let the drivers do their thing, then... */
+ usb_autosuspend_device(udev);
+ }
}
return status;
}
@@ -2446,11 +2416,6 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
return status;
}
-int usb_remote_wakeup(struct usb_device *udev)
-{
- return 0;
-}
-
#endif
static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
@@ -3268,7 +3233,7 @@ static void hub_events(void)
* disconnected while waiting for the lock to succeed. */
usb_lock_device(hdev);
if (unlikely(hub->disconnected))
- goto loop2;
+ goto loop_disconnected;
/* If the hub has died, clean up after it */
if (hdev->state == USB_STATE_NOTATTACHED) {
@@ -3428,7 +3393,7 @@ static void hub_events(void)
* kick_khubd() and allow autosuspend.
*/
usb_autopm_put_interface(intf);
- loop2:
+ loop_disconnected:
usb_unlock_device(hdev);
kref_put(&hub->kref, hub_release);
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index df73574a9cc..73de41bb254 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1843,7 +1843,6 @@ free_interfaces:
intf->dev.dma_mask = dev->dev.dma_mask;
INIT_WORK(&intf->reset_ws, __usb_queue_reset_device);
device_initialize(&intf->dev);
- mark_quiesced(intf);
dev_set_name(&intf->dev, "%d-%s:%d.%d",
dev->bus->busnum, dev->devpath,
configuration, alt->desc.bInterfaceNumber);
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 0daff0d968b..32966ccdff6 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -49,9 +49,6 @@ const char *usbcore_name = "usbcore";
static int nousb; /* Disable USB when built into kernel image */
-/* Workqueue for autosuspend and for remote wakeup of root hubs */
-struct workqueue_struct *ksuspend_usb_wq;
-
#ifdef CONFIG_USB_SUSPEND
static int usb_autosuspend_delay = 2; /* Default delay value,
* in seconds */
@@ -264,23 +261,6 @@ static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
#ifdef CONFIG_PM
-static int ksuspend_usb_init(void)
-{
- /* This workqueue is supposed to be both freezable and
- * singlethreaded. Its job doesn't justify running on more
- * than one CPU.
- */
- ksuspend_usb_wq = create_freezeable_workqueue("ksuspend_usbd");
- if (!ksuspend_usb_wq)
- return -ENOMEM;
- return 0;
-}
-
-static void ksuspend_usb_cleanup(void)
-{
- destroy_workqueue(ksuspend_usb_wq);
-}
-
/* USB device Power-Management thunks.
* There's no need to distinguish here between quiescing a USB device
* and powering it down; the generic_suspend() routine takes care of
@@ -296,7 +276,7 @@ static int usb_dev_prepare(struct device *dev)
static void usb_dev_complete(struct device *dev)
{
/* Currently used only for rebinding interfaces */
- usb_resume(dev, PMSG_RESUME); /* Message event is meaningless */
+ usb_resume(dev, PMSG_ON); /* FIXME: change to PMSG_COMPLETE */
}
static int usb_dev_suspend(struct device *dev)
@@ -342,9 +322,7 @@ static const struct dev_pm_ops usb_device_pm_ops = {
#else
-#define ksuspend_usb_init() 0
-#define ksuspend_usb_cleanup() do {} while (0)
-#define usb_device_pm_ops (*(struct dev_pm_ops *)0)
+#define usb_device_pm_ops (*(struct dev_pm_ops *) NULL)
#endif /* CONFIG_PM */
@@ -472,9 +450,6 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
INIT_LIST_HEAD(&dev->filelist);
#ifdef CONFIG_PM
- mutex_init(&dev->pm_mutex);
- INIT_DELAYED_WORK(&dev->autosuspend, usb_autosuspend_work);
- INIT_WORK(&dev->autoresume, usb_autoresume_work);
dev->autosuspend_delay = usb_autosuspend_delay * HZ;
dev->connect_time = jiffies;
dev->active_duration = -jiffies;
@@ -1117,9 +1092,6 @@ static int __init usb_init(void)
if (retval)
goto out;
- retval = ksuspend_usb_init();
- if (retval)
- goto out;
retval = bus_register(&usb_bus_type);
if (retval)
goto bus_register_failed;
@@ -1159,7 +1131,7 @@ major_init_failed:
bus_notifier_failed:
bus_unregister(&usb_bus_type);
bus_register_failed:
- ksuspend_usb_cleanup();
+ usb_debugfs_cleanup();
out:
return retval;
}
@@ -1181,7 +1153,6 @@ static void __exit usb_exit(void)
usb_hub_cleanup();
bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
bus_unregister(&usb_bus_type);
- ksuspend_usb_cleanup();
usb_debugfs_cleanup();
}
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 2b74a7f99c4..cd882203ad3 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -55,25 +55,8 @@ extern void usb_major_cleanup(void);
extern int usb_suspend(struct device *dev, pm_message_t msg);
extern int usb_resume(struct device *dev, pm_message_t msg);
-extern void usb_autosuspend_work(struct work_struct *work);
-extern void usb_autoresume_work(struct work_struct *work);
extern int usb_port_suspend(struct usb_device *dev, pm_message_t msg);
extern int usb_port_resume(struct usb_device *dev, pm_message_t msg);
-extern int usb_external_suspend_device(struct usb_device *udev,
- pm_message_t msg);
-extern int usb_external_resume_device(struct usb_device *udev,
- pm_message_t msg);
-extern int usb_remote_wakeup(struct usb_device *dev);
-
-static inline void usb_pm_lock(struct usb_device *udev)
-{
- mutex_lock_nested(&udev->pm_mutex, udev->level);
-}
-
-static inline void usb_pm_unlock(struct usb_device *udev)
-{
- mutex_unlock(&udev->pm_mutex);
-}
#else
@@ -87,14 +70,6 @@ static inline int usb_port_resume(struct usb_device *udev, pm_message_t msg)
return 0;
}
-static inline int usb_remote_wakeup(struct usb_device *udev)
-{
- return 0;
-}
-
-static inline void usb_pm_lock(struct usb_device *udev) {}
-static inline void usb_pm_unlock(struct usb_device *udev) {}
-
#endif
#ifdef CONFIG_USB_SUSPEND
@@ -102,6 +77,7 @@ static inline void usb_pm_unlock(struct usb_device *udev) {}
extern void usb_autosuspend_device(struct usb_device *udev);
extern void usb_try_autosuspend_device(struct usb_device *udev);
extern int usb_autoresume_device(struct usb_device *udev);
+extern int usb_remote_wakeup(struct usb_device *dev);
#else
@@ -112,9 +88,13 @@ static inline int usb_autoresume_device(struct usb_device *udev)
return 0;
}
+static inline int usb_remote_wakeup(struct usb_device *udev)
+{
+ return 0;
+}
+
#endif
-extern struct workqueue_struct *ksuspend_usb_wq;
extern struct bus_type usb_bus_type;
extern struct device_type usb_device_type;
extern struct device_type usb_if_device_type;
@@ -144,23 +124,6 @@ static inline int is_usb_device_driver(struct device_driver *drv)
for_devices;
}
-/* Interfaces and their "power state" are owned by usbcore */
-
-static inline void mark_active(struct usb_interface *f)
-{
- f->is_active = 1;
-}
-
-static inline void mark_quiesced(struct usb_interface *f)
-{
- f->is_active = 0;
-}
-
-static inline int is_active(const struct usb_interface *f)
-{
- return f->is_active;
-}
-
/* for labeling diagnostics */
extern const char *usbcore_name;
diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index 3dab0c0b196..707a87da77f 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -1580,10 +1580,6 @@ usbtest_ioctl (struct usb_interface *intf, unsigned int code, void *buf)
return -ERESTARTSYS;
/* FIXME: What if a system sleep starts while a test is running? */
- if (!intf->is_active) {
- mutex_unlock(&dev->lock);
- return -EHOSTUNREACH;
- }
/* some devices, like ez-usb default devices, need a non-default
* altsetting to have any active endpoints. some tests change
diff --git a/include/linux/usb.h b/include/linux/usb.h
index e6419ac89ea..ad50fc8a7ad 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -122,7 +122,6 @@ enum usb_interface_condition {
* number from the USB core by calling usb_register_dev().
* @condition: binding state of the interface: not bound, binding
* (in probe()), bound to a driver, or unbinding (in disconnect())
- * @is_active: flag set when the interface is bound and not suspended.
* @sysfs_files_created: sysfs attributes exist
* @ep_devs_created: endpoint child pseudo-devices exist
* @unregistering: flag set when the interface is being unregistered
@@ -135,8 +134,7 @@ enum usb_interface_condition {
* @dev: driver model's view of this device
* @usb_dev: if an interface is bound to the USB major, this will point
* to the sysfs representation for that device.
- * @pm_usage_cnt: PM usage counter for this interface; autosuspend is not
- * allowed unless the counter is 0.
+ * @pm_usage_cnt: PM usage counter for this interface
* @reset_ws: Used for scheduling resets from atomic context.
* @reset_running: set to 1 if the interface is currently running a
* queued reset so that usb_cancel_queued_reset() doesn't try to
@@ -184,7 +182,6 @@ struct usb_interface {
int minor; /* minor number this interface is
* bound to */
enum usb_interface_condition condition; /* state of binding */
- unsigned is_active:1; /* the interface is not suspended */
unsigned sysfs_files_created:1; /* the sysfs attributes exist */
unsigned ep_devs_created:1; /* endpoint "devices" exist */
unsigned unregistering:1; /* unregistration is in progress */
@@ -401,7 +398,6 @@ struct usb_tt;
* @portnum: parent port number (origin 1)
* @level: number of USB hub ancestors
* @can_submit: URBs may be submitted
- * @discon_suspended: disconnected while suspended
* @persist_enabled: USB_PERSIST enabled for this device
* @have_langid: whether string_langid is valid
* @authorized: policy has said we can use it;
@@ -421,20 +417,15 @@ struct usb_tt;
* @usbfs_dentry: usbfs dentry entry for the device
* @maxchild: number of ports if hub
* @children: child devices - USB devices that are attached to this hub
- * @pm_usage_cnt: usage counter for autosuspend
* @quirks: quirks of the whole device
* @urbnum: number of URBs submitted for the whole device
* @active_duration: total time device is not suspended
- * @autosuspend: for delayed autosuspends
- * @autoresume: for autoresumes requested while in_interrupt
- * @pm_mutex: protects PM operations
* @last_busy: time of last use
* @autosuspend_delay: in jiffies
* @connect_time: time device was first connected
* @do_remote_wakeup: remote wakeup should be enabled
* @reset_resume: needs reset instead of resume
* @autosuspend_disabled: autosuspend disabled by the user
- * @skip_sys_resume: skip the next system resume
* @wusb_dev: if this is a Wireless USB device, link to the WUSB
* specific data for the device.
* @slot_id: Slot ID assigned by xHCI
@@ -475,7 +466,6 @@ struct usb_device {
u8 level;
unsigned can_submit:1;
- unsigned discon_suspended:1;
unsigned persist_enabled:1;
unsigned have_langid:1;
unsigned authorized:1;
@@ -499,17 +489,12 @@ struct usb_device {
int maxchild;
struct usb_device *children[USB_MAXCHILDREN];
- int pm_usage_cnt;
u32 quirks;
atomic_t urbnum;
unsigned long active_duration;
#ifdef CONFIG_PM
- struct delayed_work autosuspend;
- struct work_struct autoresume;
- struct mutex pm_mutex;
-
unsigned long last_busy;
int autosuspend_delay;
unsigned long connect_time;
@@ -517,7 +502,6 @@ struct usb_device {
unsigned do_remote_wakeup:1;
unsigned reset_resume:1;
unsigned autosuspend_disabled:1;
- unsigned skip_sys_resume:1;
#endif
struct wusb_dev *wusb_dev;
int slot_id;
@@ -549,17 +533,8 @@ extern int usb_autopm_get_interface(struct usb_interface *intf);
extern void usb_autopm_put_interface(struct usb_interface *intf);
extern int usb_autopm_get_interface_async(struct usb_interface *intf);
extern void usb_autopm_put_interface_async(struct usb_interface *intf);
-
-static inline void usb_autopm_get_interface_no_resume(
- struct usb_interface *intf)
-{
- atomic_inc(&intf->pm_usage_cnt);
-}
-static inline void usb_autopm_put_interface_no_suspend(
- struct usb_interface *intf)
-{
- atomic_dec(&intf->pm_usage_cnt);
-}
+extern void usb_autopm_get_interface_no_resume(struct usb_interface *intf);
+extern void usb_autopm_put_interface_no_suspend(struct usb_interface *intf);
static inline void usb_mark_last_busy(struct usb_device *udev)
{