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From: "Ju, Seokmann" <Seokmann.Ju@lsil.com>
To: "James Bottomley" <James.Bottomley@SteelEye.com>
Cc: "linux-scsi" <linux-scsi@vger.kernel.org>,
	"linux-kernel" <linux-kernel@vger.kernel.org>
Subject: Question: where should the SCSI driver place MODE_SENSE data ?
Date: Tue, 21 Mar 2006 09:44:39 -0700	[thread overview]
Message-ID: <9738BCBE884FDB42801FAD8A7769C265142114@NAMAIL1.ad.lsil.com> (raw)

In the 2.6 (2.6.9 and scsi-misc in git) kernel, MODE_SENSE SCSI command
packet (scsi_cmnd) carries following entries with unexpectedly small in
size.
- request_bufflen
- bufflen

Especially for MODE SENSE with page code 8 (caching page), driver has
minumum 12 Bytes MODE_SENSE data to deliver besides 'mode parameter
header' and 'block descriptors'.
When I dump those entries, they both are 4 Bytes in size.
To me, it seems like that SCSI mid layer allocated 512 Bytes for
MODE_SENSE data buffer, but the buffer length passed down to LLD
incorrectly.

Please guide me if there is anything missing.

Thank you,

Seokmann

             reply	other threads:[~2006-03-21 16:44 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-03-21 16:44 Ju, Seokmann [this message]
2006-03-21 23:01 ` James Bottomley
2006-03-21 22:43 Ju, Seokmann
2006-03-22 15:52 Ju, Seokmann
2006-03-22 16:14 ` James Bottomley

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