linux-kernel - Re: [PATCH 1/1] usb: gadget: Don't attempt to dequeue requests for a disabled USB endpoint on Freescale hardware

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Date:	Mon, 22 Oct 2012 10:53:08 +0300
From:	Felipe Balbi <balbi@...com>
To:	Li Yang-R58472 <r58472@...escale.com>
CC:	"balbi@...com" <balbi@...com>,
	Simon Haggett <simon.haggett@...lvnc.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [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@...com]
> > Sent: Saturday, October 20, 2012 1:37 AM
> > To: Simon Haggett
> > Cc: Li Yang-R58472; Felipe Balbi; Greg Kroah-Hartman; linux-
> > usb@...r.kernel.org; linuxppc-dev@...ts.ozlabs.org; linux-
> > kernel@...r.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

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