From: Arjan van de Ven <arjan@infradead.org>
To: Joerg Schilling <Joerg.Schilling@fokus.fraunhofer.de>
Cc: schilling@fokus.fraunhofer.de, linux-kernel@vger.kernel.org
Subject: Re: SCSI over USB showstopper bug?
Date: Tue, 31 Oct 2006 23:18:10 +0100 [thread overview]
Message-ID: <1162333090.3044.53.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <4547c966.8oyAB/pzCZ7bGUza%Joerg.Schilling@fokus.fraunhofer.de>
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
next prev parent reply other threads:[~2006-10-31 22:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-31 22:08 Joerg Schilling
2006-10-31 22:18 ` Arjan van de Ven [this message]
2006-10-31 23:51 ` Joerg Schilling
2006-11-01 15:31 ` Jens Axboe
2006-11-01 18:25 ` Joerg Schilling
2006-11-01 18:31 ` Jens Axboe
2006-11-06 16:00 ` Joerg Schilling
2006-11-06 16:07 ` Jens Axboe
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