Linux-libre 4.4-gnupck-4.4-gnu

1 files changed, 21 insertions, 4 deletions

diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c
index 6399c106a..30fdab0ae 100644
--- a/drivers/usb/gadget/epautoconf.c
+++ b/drivers/usb/gadget/epautoconf.c
@@ -53,13 +53,13 @@
  * the restrictions that may apply. Some combinations of driver
  * and hardware won't be able to autoconfigure.
  *
- * On success, this returns an un-claimed usb_ep, and modifies the endpoint
+ * On success, this returns an claimed usb_ep, and modifies the endpoint
  * descriptor bEndpointAddress.  For bulk endpoints, the wMaxPacket value
  * is initialized as if the endpoint were used at full speed and
  * the bmAttribute field in the ep companion descriptor is
  * updated with the assigned number of streams if it is
  * different from the original value. To prevent the endpoint
- * from being returned by a later autoconfig call, claim it by
+ * from being returned by a later autoconfig call, claims it by
  * assigning ep->claimed to true.
  *
  * On failure, this returns a null endpoint descriptor.
@@ -154,10 +154,10 @@ EXPORT_SYMBOL_GPL(usb_ep_autoconfig_ss);
  * USB controller, and it can't know all the restrictions that may apply.
  * Some combinations of driver and hardware won't be able to autoconfigure.
  *
- * On success, this returns an un-claimed usb_ep, and modifies the endpoint
+ * On success, this returns an claimed usb_ep, and modifies the endpoint
  * descriptor bEndpointAddress.  For bulk endpoints, the wMaxPacket value
  * is initialized as if the endpoint were used at full speed.  To prevent
- * the endpoint from being returned by a later autoconfig call, claim it
+ * the endpoint from being returned by a later autoconfig call, claims it
  * by assigning ep->claimed to true.
  *
  * On failure, this returns a null endpoint descriptor.
@@ -172,6 +172,23 @@ struct usb_ep *usb_ep_autoconfig(
 EXPORT_SYMBOL_GPL(usb_ep_autoconfig);
 
 /**
+ * usb_ep_autoconfig_release - releases endpoint and set it to initial state
+ * @ep: endpoint which should be released
+ *
+ * This function can be used during function bind for endpoints obtained
+ * from usb_ep_autoconfig(). It unclaims endpoint claimed by
+ * usb_ep_autoconfig() to make it available for other functions. Endpoint
+ * which was released is no longer invalid and shouldn't be used in
+ * context of function which released it.
+ */
+void usb_ep_autoconfig_release(struct usb_ep *ep)
+{
+	ep->claimed = false;
+	ep->driver_data = NULL;
+}
+EXPORT_SYMBOL_GPL(usb_ep_autoconfig_release);
+
+/**
  * usb_ep_autoconfig_reset - reset endpoint autoconfig state
  * @gadget: device for which autoconfig state will be reset
  *