linux-kernel - Re: 2.6.30-rc2-git2: Reported regressions from 2.6.29

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Date:	Sat, 18 Apr 2009 14:33:09 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	leiming <tom.leiming@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	Linux PM List <linux-pm@...ts.linux-foundation.org>,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	video4linux-list@...hat.com, laurent.pinchart@...net.be,
	mchehab@...radead.org
Subject: Re: 2.6.30-rc2-git2: Reported regressions from 2.6.29

On Saturday 18 April 2009, leiming wrote:
> On Fri, 17 Apr 2009 19:55:29 -0700 (PDT)
> Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> 
> > > @@ -742,7 +742,7 @@ static int uvc_alloc_urb_buffers(struct
> > > uvc_video_device *video, 
> > >  	/* Buffers are already allocated, bail out. */
> > >  	if (video->urb_size)
> > > -		return 0;
> > > +		return DIV_ROUND_UP(video->urb_size, psize);
> > 
> > I don't think this is right. It should round _down_.
> > 
> > It's supposed to return 'npackets', but if you pass it a different
> > packet size than it was passed originally, it can now return a
> > potentially bigger number than the already allocated buffer, no?
> > 
> > So I think it should round down (ie use a regular divide). No?
> 
> Yes,you are correct, please ignore my last reply, and following is
> the fixed patch.
> 
> Thanks.

Thanks for the patch, I've updated the bug entry to point to it.

Best,
Rafael


> From a3b3d72cdd57a0699fb643b41b78eb7beb211ff5 Mon Sep 17 00:00:00 2001
> From: Ming Lei <tom.leiming@...il.com>
> Date: Wed, 15 Apr 2009 22:32:51 +0800
> Subject: [PATCH] V4L/DVB:usbvideo:fix uvc resume failed(v2)
> 
> Now urb buffers is not freed before suspend, so uvc_alloc_urb_buffers
> should return packet counts allocated originally during uvc resume
> , instead of zero.
> 
> This version uses round down to return packet counts on Linus's
> suggestions, or else may lead to buffer destructed if packet size
> is changed before calling uvc_alloc_urb_buffers() in this kind of
> case.
> 
> This patch is against v2.6.30-rc2.
> 
> Signed-off-by: Ming Lei <tom.leiming@...il.com>
> ---
>  drivers/media/video/uvc/uvc_video.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c
> index a95e173..6ce974d 100644
> --- a/drivers/media/video/uvc/uvc_video.c
> +++ b/drivers/media/video/uvc/uvc_video.c
> @@ -742,7 +742,7 @@ static int uvc_alloc_urb_buffers(struct uvc_video_device *video,
>  
>  	/* Buffers are already allocated, bail out. */
>  	if (video->urb_size)
> -		return 0;
> +		return video->urb_size / psize;
>  
>  	/* Compute the number of packets. Bulk endpoints might transfer UVC
>  	 * payloads accross multiple URBs.
> -- 
> 1.6.0.GIT
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