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Subject[PATCH 4.14 017/164] usb: gadget: udc: core: update usb_ep_queue() documentation
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Felipe Balbi <felipe.balbi@linux.intel.com>

commit eaa358c7790338d83bb6a31258bdc077de120414 upstream.

Mention that ->complete() should never be called from within
usb_ep_queue().

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/gadget/udc/core.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -249,6 +249,9 @@ EXPORT_SYMBOL_GPL(usb_ep_free_request);
* arranges to poll once per interval, and the gadget driver usually will
* have queued some data to transfer at that time.
*
+ * Note that @req's ->complete() callback must never be called from
+ * within usb_ep_queue() as that can create deadlock situations.
+ *
* Returns zero, or a negative error code. Endpoints that are not enabled
* report errors; errors will also be
* reported when the usb peripheral is disconnected.

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