Re: [patch 25/28] Fix old SCSI adapter crashes with CD-ROM (take 2)

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On Thu, 2007-05-10 at 23:01 -0700, akpm@xxxxxxxxxxxxxxxxxxxx wrote:
> From: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
> 
> 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.
> 
> (akpm: placeholder fix.  Apparently the metaphorical Mike is working on a real
> fix).

No, we fixed this in a different way ... the fix should already be in
git head.

James


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