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

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Date:	Tue, 8 May 2007 18:14:44 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	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, 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.

-- 
Jens Axboe

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