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

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Date:	Fri, 11 May 2007 11:18:53 -0500
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	torvalds@...l.org
Subject: Re: [PATCH]: Fix old SCSI adapter crashes with CD-ROM

On Tue, 2007-05-08 at 17:03 +0100, 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.

OK, the alternative fix for this is in the vanilla tree.

Could you make sure it works ... if it does, I think it's a candidate
for 2.6.21 stable as well.

James


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