linux-kernel - [PATCH 1/2] cciss: Fix scsi tape io with more than 255 scatter gather elements

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Message-ID: <20120322180852.14453.3206.stgit@beardog.cce.hp.com>
Date:	Thu, 22 Mar 2012 13:08:52 -0500
From:	"Stephen M. Cameron" <scameron@...rdog.cce.hp.com>
To:	axboe@...nel.dk
Cc:	stephenmcameron@...il.com, akpm@...ux-foundation.org,
	mikem@...rdog.cce.hp.com, linux-kernel@...r.kernel.org,
	thenzl@...hat.com
Subject: [PATCH 1/2] cciss: Fix scsi tape io with more than 255 scatter gather
	elements

From: Stephen M. Cameron <scameron@...rdog.cce.hp.com>

The total number of scatter gather elements in the CISS command
used by the scsi tape code was being cast to a u8, which can hold
at most 255 scatter gather elements.  It should have been cast to
a u16.  Without this patch the command gets rejected by the controller
since the total scatter gather count did not add up to the right
value resulting in an i/o error.

Signed-off-by: Stephen M. Cameron <scameron@...rdog.cce.hp.com>
Cc: stable@...r.kernel.org
---
 drivers/block/cciss_scsi.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/block/cciss_scsi.c b/drivers/block/cciss_scsi.c
index e820b68..1162f7b 100644
--- a/drivers/block/cciss_scsi.c
+++ b/drivers/block/cciss_scsi.c
@@ -1410,7 +1410,7 @@ static void cciss_scatter_gather(ctlr_info_t *h, CommandList_struct *c,
 	/* track how many SG entries we are using */
 	if (request_nsgs > h->maxSG)
 		h->maxSG = request_nsgs;
-	c->Header.SGTotal = (__u8) request_nsgs + chained;
+	c->Header.SGTotal = (u16) request_nsgs + chained;
 	if (request_nsgs > h->max_cmd_sgentries)
 		c->Header.SGList = h->max_cmd_sgentries;
 	else

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