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path: root/drivers/usb/core/hcd.h
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Diffstat (limited to 'drivers/usb/core/hcd.h')
-rw-r--r--drivers/usb/core/hcd.h19
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index 79782a1c43f..d8b43aee581 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -111,6 +111,20 @@ struct usb_hcd {
u64 rsrc_len; /* memory/io resource length */
unsigned power_budget; /* in mA, 0 = no limit */
+ /* bandwidth_mutex should be taken before adding or removing
+ * any new bus bandwidth constraints:
+ * 1. Before adding a configuration for a new device.
+ * 2. Before removing the configuration to put the device into
+ * the addressed state.
+ * 3. Before selecting a different configuration.
+ * 4. Before selecting an alternate interface setting.
+ *
+ * bandwidth_mutex should be dropped after a successful control message
+ * to the device, or resetting the bandwidth after a failed attempt.
+ */
+ struct mutex bandwidth_mutex;
+
+
#define HCD_BUFFER_POOLS 4
struct dma_pool *pool [HCD_BUFFER_POOLS];
@@ -290,9 +304,10 @@ extern void usb_hcd_disable_endpoint(struct usb_device *udev,
extern void usb_hcd_reset_endpoint(struct usb_device *udev,
struct usb_host_endpoint *ep);
extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
-extern int usb_hcd_check_bandwidth(struct usb_device *udev,
+extern int usb_hcd_alloc_bandwidth(struct usb_device *udev,
struct usb_host_config *new_config,
- struct usb_interface *new_intf);
+ struct usb_host_interface *old_alt,
+ struct usb_host_interface *new_alt);
extern int usb_hcd_get_frame_number(struct usb_device *udev);
extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,