linux-kernel - Re: [PATCH]: Fix old SCSI adapter crashes with CD-ROM (take 2)

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Date:	Tue, 08 May 2007 11:39:36 -0500
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-scsi@...r.kernel.org,
	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH]: Fix old SCSI adapter crashes with CD-ROM (take 2)

On Tue, 2007-05-08 at 18:14 +0200, Jens Axboe wrote:
> On Tue, May 08 2007, Alan Cox wrote:
> > The CD-ROM layer doesn't bounce requests for old ISA controllers (and
> > nor should it). However they get injected into the SCSI layer via
> > sr_ioctl which also doesn't bounce them and SCSI then passes the buffer
> > along to a device with unchecked_isa_dma set which either panics or
> > truncates the buffer to 24bits.
> > 
> > According to Jens the right long term fix is for the CD layer to route
> > the requests differently but in the mean time this has been tested by a
> > victim and verified to sort the problem out. For the other 99.9% of users
> > it's a no-op and doesn't bounce data.
> > 
> > Signed-off-by: Alan Cox <alan@...hat.com>
> 
> Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
> 
> Christoph passed me his patch to get rid of ->generic_packet() in the
> cdrom layer, so the work is almost complete. This patch is fine as a
> work-around until that gets merged, though.

Actually, I think the new scsi request infrastructure should be doing
the bouncing (rather than have it done in each problem path we
discover).

Mike Christie tells me we're missing bouncing by accident in the
scsi_execute path (but not the scsi_execute_async path).  He says this
is the fix he proposed:

http://marc.info/?l=linux-scsi&m=115981479822790&w=2

Can we just merge this instead?

James


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