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cciss: Fix scsi tape io with more than 255 scatter gather elements 

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@beardog.cce.hp.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Stephen M. Cameron 2012-03-22 21:40:09 +01:00 committed by Jens Axboe
parent 395d287526
commit bc67f63650
1 changed files with 1 additions and 1 deletions
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2
drivers/block/cciss_scsi.c
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@ -1411,7 +1411,7 @@ 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