4.9-stable review patch. If anyone has any objections, please let me know.
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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.