linux-kernel - Re: [PATCH] UVC: use GFP

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Date:	Thu, 22 Nov 2012 14:22:23 +0200
From:	Felipe Balbi <balbi@...com>
To:	walter harms <wharms@....de>
CC:	Cyril Roelandt <tipecaml@...il.com>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<gregkh@...uxfoundation.org>, <balbi@...com>,
	<laurent.pinchart@...asonboard.com>,
	<kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] UVC: use GFP_ATOMIC under spin lock.

On Thu, Nov 22, 2012 at 09:09:57AM +0100, walter harms wrote:
> 
> 
> Am 19.11.2012 22:34, schrieb Cyril Roelandt:
> > Found using the following semantic patch:
> > <spml>
> > @@
> > @@
> > spin_lock_irqsave(...);
> > ... when != spin_unlock_irqrestore(...);
> > * GFP_KERNEL
> > </spml>
> > 
> > Signed-off-by: Cyril Roelandt <tipecaml@...il.com>
> > ---
> >  drivers/usb/gadget/uvc_video.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/usb/gadget/uvc_video.c b/drivers/usb/gadget/uvc_video.c
> > index b0e53a8..79b4132 100644
> > --- a/drivers/usb/gadget/uvc_video.c
> > +++ b/drivers/usb/gadget/uvc_video.c
> > @@ -309,7 +309,7 @@ uvc_video_pump(struct uvc_video *video)
> >  		video->encode(req, video, buf);
> >  
> >  		/* Queue the USB request */
> > -		if ((ret = usb_ep_queue(video->ep, req, GFP_KERNEL)) < 0) {
> > +		if ((ret = usb_ep_queue(video->ep, req, GFP_ATOMIC)) < 0) {
> >  			printk(KERN_INFO "Failed to queue request (%d)\n", ret);
> >  			usb_ep_set_halt(video->ep);
> >  			spin_unlock_irqrestore(&video->queue.irqlock, flags);
> 
> 
> IMHO, this should be two lines, aka:
> 
> ret = usb_ep_queue(video->ep, req, GFP_KERNEL);
> if (ret<0)

correct, please resend with the fix.

-- 
balbi

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