linux-kernel - Re: 2.6.19-rc3 system freezes when ripping with cdparanoia at ioctl(SG

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Date:	Fri, 10 Nov 2006 17:23:30 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Brice Goglin <Brice.Goglin@...-lyon.org>
Cc:	Monty Montgomery <monty@...h.org>, Tejun Heo <htejun@...il.com>,
	Gregor Jasny <gjasny@...glemail.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Jeff Garzik <jgarzik@...ox.com>, linux-ide@...r.kernel.org,
	Douglas Gilbert <dougg@...que.net>
Subject: Re: 2.6.19-rc3 system freezes when ripping with cdparanoia at ioctl(SG_IO)

On Fri, Nov 10 2006, Brice Goglin wrote:
> Jens Axboe wrote:
> > On Thu, Nov 09 2006, Monty Montgomery wrote:
> >   
> >> On 11/9/06, Tejun Heo <htejun@...il.com> wrote:
> >>
> >>     
> >>> drivers/scsi/sg.c interprets SG_DXFER_TO_FROM_DEV as read while
> >>> block/scsi_ioctl.c interprets it as write.  I guess this is historic
> >>> thing (scsi/sg.c updated but block/scsi_ioctl.c is forgotten).
> >>>       
> >> Not historic; Jens accidentally implemented it backwards.  No one
> >> noticed for a long time.  I submitted a patch for this a few months
> >> ago.
> >>     
> >
> > Yeah, I wonder why that did not go in, I remember the full breadth of
> > our discussion and you are fully correct. I'll make sure it gets into
> > 2.6.19!
> >   
> 
> Note sure this patch was supposed to fix our freeze, but I just tried on
> top of rc5 and it does not seem to fix it.

It should fix Alex's issue with wrong data direction being seen, I
haven't had time to follow this thread today so cannot say.

-- 
Jens Axboe

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