linux-kernel - Re: SCSI over USB showstopper bug?

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Message-Id: <1162333090.3044.53.camel@laptopd505.fenrus.org>
Date:	Tue, 31 Oct 2006 23:18:10 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Joerg Schilling <Joerg.Schilling@...us.fraunhofer.de>
Cc:	schilling@...us.fraunhofer.de, linux-kernel@...r.kernel.org
Subject: Re: SCSI over USB showstopper bug?

On Tue, 2006-10-31 at 23:08 +0100, Joerg Schilling wrote:
> Hi,
> 
> it looks as if SG_GET_RESERVED_SIZE & SG_SET_RESERVED_SIZE
> are not in interaction with the underlying SCSI transport.
> 
> Programs like readcd and cdda2wav that try to get very large SCSI
> transfer buffers get a confirmation for nearly any SCSI transfer size 
> but later when readcd/cdda2wav try to transfer data with an
> actual SCSI command, they fail with ENOMEM.
> 
> Correct fix: let sg.c make a callback to the underlying SCSI transport
> 		and let it get a confirmation tfor the buffer size.
> 
> Quick and dirty fix: reduce the maximum allowed DMA size to the smallest
> 		max DMA size of all SCSI transports.

real good fix:

use SG_IO on the device directly that checks this already




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