linux-kernel - SCSI over USB showstopper bug?

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Message-ID: <4547c966.8oyAB/pzCZ7bGUza%Joerg.Schilling@fokus.fraunhofer.de>
Date:	Tue, 31 Oct 2006 23:08:38 +0100
From:	Joerg.Schilling@...us.fraunhofer.de (Joerg Schilling)
To:	schilling@...us.fraunhofer.de, linux-kernel@...r.kernel.org
Subject: SCSI over USB showstopper bug?

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.

Jörg

-- 
 EMail:joerg@...ily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
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       schilling@...us.fraunhofer.de     (work) Blog: http://schily.blogspot.com/
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