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path: root/drivers/usb/core/driver.c
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Diffstat (limited to 'drivers/usb/core/driver.c')
-rw-r--r--drivers/usb/core/driver.c63
1 files changed, 55 insertions, 8 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index b0db1583c52..eefc98584ea 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -783,7 +783,7 @@ static int resume_device(struct usb_device *udev)
return udriver->resume(udev);
}
-/* Caller has locked intf */
+/* Caller has locked intf's usb_device */
static int suspend_interface(struct usb_interface *intf, pm_message_t msg)
{
struct usb_driver *driver;
@@ -815,7 +815,7 @@ static int suspend_interface(struct usb_interface *intf, pm_message_t msg)
return status;
}
-/* Caller has locked intf */
+/* Caller has locked intf's usb_device */
static int resume_interface(struct usb_interface *intf)
{
struct usb_driver *driver;
@@ -856,14 +856,59 @@ static int resume_interface(struct usb_interface *intf)
return 0;
}
+/* Caller has locked udev */
+int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
+{
+ int status = 0;
+ int i = 0;
+ struct usb_interface *intf;
+
+ if (udev->actconfig) {
+ for (; i < udev->actconfig->desc.bNumInterfaces; i++) {
+ intf = udev->actconfig->interface[i];
+ status = suspend_interface(intf, msg);
+ if (status != 0)
+ break;
+ }
+ }
+ if (status == 0)
+ status = suspend_device(udev, msg);
+
+ /* If the suspend failed, resume interfaces that did get suspended */
+ if (status != 0) {
+ while (--i >= 0) {
+ intf = udev->actconfig->interface[i];
+ resume_interface(intf);
+ }
+ }
+ return status;
+}
+
+/* Caller has locked udev */
+int usb_resume_both(struct usb_device *udev)
+{
+ int status;
+ int i;
+ struct usb_interface *intf;
+
+ status = resume_device(udev);
+ if (status == 0 && udev->actconfig) {
+ for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
+ intf = udev->actconfig->interface[i];
+ resume_interface(intf);
+ }
+ }
+ return status;
+}
+
static int usb_suspend(struct device *dev, pm_message_t message)
{
int status;
if (is_usb_device(dev))
- status = suspend_device(to_usb_device(dev), message);
+ status = usb_suspend_both(to_usb_device(dev), message);
else
- status = suspend_interface(to_usb_interface(dev), message);
+ status = 0;
return status;
}
@@ -871,10 +916,12 @@ static int usb_resume(struct device *dev)
{
int status;
- if (is_usb_device(dev))
- status = resume_device(to_usb_device(dev));
- else
- status = resume_interface(to_usb_interface(dev));
+ if (is_usb_device(dev)) {
+ status = usb_resume_both(to_usb_device(dev));
+
+ /* Rebind drivers that had no suspend method? */
+ } else
+ status = 0;
return status;
}