[PATCH 1/1] usb: gadget: Don't attempt to dequeue requests for a disabled USB endpoint on Freescale hardware
laurent.pinchart at ideasonboard.com
Thu Oct 25 11:36:24 EST 2012
On Monday 22 October 2012 13:56:01 Felipe Balbi wrote:
> On Mon, Oct 22, 2012 at 12:47:21PM +0200, Laurent Pinchart wrote:
> > On Monday 22 October 2012 03:33:19 Li Yang-R58472 wrote:
> > > On Saturday, October 20, 2012 1:37 AM Felipe Balbi wrote:
> > > > On Fri, Oct 19, 2012 at 06:19:26PM +0100, Simon Haggett wrote:
> > > > > Some gadget drivers may attempt to dequeue requests for an endpoint
> > > > > that has already been disabled. For example, in the UVC gadget
> > > > > driver, uvc_function_set_alt() will call usb_ep_disable() when alt
> > > > > setting 0 is selected. When the userspace application subsequently
> > > > > issues the VIDIOC_STREAMOFF ioctl, uvc_video_enable() invokes
> > > > > usb_ep_dequeue() to ensure that all requests have been cancelled.
> > > >
> > > > bug is on uvc gadget, then. Laurent ?
> > We've discussed this topic a couple of months before. I believe that's not
> > a bug.
> > http://188.8.131.52/lists/linux-usb/msg68869.html
> fair enough :-)
> That's a different case, however. At the link above we're discussing
> dequeueing a request which is already being dequeued. $SUBJECT is trying
> to fix dequeueing of a request for an endpoint which isn't even enabled.
You've got a point there :-) That's a different case indeed, I'm open to (at
least evaluating) a fix in the UVC gadget driver if you think that's better.
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