lkml.org 
[lkml]   [2012]   [Oct]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/1] usb: gadget: Don't attempt to dequeue requests for a disabled USB endpoint on Freescale hardware
On Mon, Oct 22, 2012 at 03:33:19AM +0000, Li Yang-R58472 wrote:
>
>
> > -----Original Message-----
> > From: Felipe Balbi [mailto:balbi@ti.com]
> > Sent: Saturday, October 20, 2012 1:37 AM
> > To: Simon Haggett
> > Cc: Li Yang-R58472; Felipe Balbi; Greg Kroah-Hartman; linux-
> > usb@vger.kernel.org; linuxppc-dev@lists.ozlabs.org; linux-
> > kernel@vger.kernel.org; Laurent Pinchart
> > Subject: Re: [PATCH 1/1] usb: gadget: Don't attempt to dequeue requests
> > for a disabled USB endpoint on Freescale hardware
> >
> > Hi,
> >
> > 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 ?
> >
> > Also, fsl should be removed from the tree, I'm trying to persuade iMX
> > folks to use drivers/usb/chipidea instead.
>
> Besides the iMX usage, the driver is also being used by many Freescale
> PowerPC/Coldfire SoCs. I agree that it's ideal to move to a common
> driver. But it is a large task to make the chipidea driver works for
> all the hardware that fsl_udc had supported and been tested on.

I understand that, but we just can't keep so many duplicated drivers in
mainline. chipidea udc had at least 3 different implementations. Now
it's the time to combine all of those and stick to a single driver.

Just make a plan to slowly move towards chipidea in the upcoming few
merge windows. I can continue to take in bugfixes for fsl_udc, but only
if I see that you guys are working towards merging with chipidea driver.

--
balbi
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2012-10-22 10:41    [W:0.067 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site