From: Luben Tuikov <luben@splentec.com>
To: Douglas Gilbert <dougg@torque.net>
Cc: tonyb@cybernetics.com, linux-scsi@vger.kernel.org,
linux-ide@vger.kernel.org
Subject: Re: ide-scsi data transfer residuals
Date: Tue, 16 Jul 2002 14:00:53 -0400 [thread overview]
Message-ID: <3D345F55.B8A2B21D@splentec.com> (raw)
In-Reply-To: 3D265179.BB1444E1@torque.net
Douglas Gilbert wrote:
>
> Of the drivers that support "resid" most given a scatter
> gather list will use the sum of the element lengths instead
> of bufflen. Unfortunately that sum can be larger the bufflen
> due to padding and alignment requirements of the most backward
> DMA engines out there (I was burnt by the aha1542 ISA card).
And aic7xxx ``supports'' only that kind of ``residual'' ONLY
for SCSI READ, but is seems to use scsi_cmnd::bufflen for SCSI
WRITE.
Anyway, I consider this a bug as all data was read after a READ but by
setting scsi_cmd::resid in the low-level device driver (aic7xxx)
nothing works (fs layer)...
> IOW HBA driver writers, please use bufflen.
This message should probably be put somewhere right in
scsi_cmnd definition.
--
Luben
next prev parent reply other threads:[~2002-07-16 18:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-05 14:07 ide-scsi data transfer residuals Tony Battersby
2002-07-06 2:10 ` Douglas Gilbert
2002-07-06 2:10 ` Douglas Gilbert
2002-07-08 19:33 ` Tony Battersby
2002-07-16 18:00 ` Luben Tuikov
2002-07-16 18:00 ` Luben Tuikov [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-07-08 16:17 Martin Peschke3
2002-07-08 16:17 Martin Peschke3
2002-07-05 14:07 Tony Battersby
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