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

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Date:	Sat, 9 May 2009 11:28:19 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Laurent Pinchart <laurent.pinchart@...net.be>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	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, mchehab@...radead.org
Subject: Re: 2.6.30-rc2-git2: Reported regressions from 2.6.29

On Wed, 22 Apr 2009 01:21:10 +0200
Laurent Pinchart <laurent.pinchart@...net.be> wrote:

> Hi,
> 
> On Tuesday 21 April 2009 03:47:34 Ming Lei wrote:
> > 2009/4/21 Laurent Pinchart <laurent.pinchart@...net.be>:
> > > On Saturday 18 April 2009 06:51:11 leiming wrote:

> > >> 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.
> > >
> > > The comment is misleading. If the packet size changes we need to
> > > reallocate the buffers anyway. Have you checked if the packet
> > > size (which depends on the endpoint being selected) can be
> > > changed between suspend and resume, either by the uvcvideo driver
> > > (I don't think it can) or the USB core ?
> >
> > The packet size does not change between suspend and resume.  I mean
> > uvc_alloc_urb_buffers() still can be used in other cases if buffers
> > was not freed and is reuesed in future. It seems there is no such
> > cases in uvcvideo now, but uvc_alloc_urb_buffers() really __can__
> > work in such case, isn't it?
> >
> > IMHO It is only used to allocate or reserve UVC_URBS usb buffers,
> > which size is video->urb_size, and npackets can be shortened or
> > enlarged if psize is changed, after all.
> 
> You're right. Patch applied, thanks.

Rc5 has been released today, why isn't this patch accepted by upstream
now?  It is really a bug fix.

Thanks.

> 
> Best regards,
> 
> Laurent Pinchart
> 

-- 
Lei Ming
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