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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Felipe Balbi <felipe.balbi@linux.intel.com>
Subject: [PATCH 4.9 11/95] usb: gadget: udc: core: update usb_ep_queue() documentation
Date:   Sun, 22 Apr 2018 15:52:40 +0200
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4.9-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
@@ -248,6 +248,9 @@ 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.