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[SCSI] qla2xxx: Check for empty slot in request queue before posting Command type 6 request.

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For ISP82xx, the check for empty slot in request queue before posting command type 6
request was missing. This could lead to request queue entry corruptions causing
IO timeouts.

Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Giridhar Malavali 2010-09-03 14:57:05 -07:00 committed by James Bottomley
parent 0374f55ed8
commit 1bd58b89e8
1 changed files with 13 additions and 0 deletions
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13
drivers/scsi/qla2xxx/qla_nx.c
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@ -2672,6 +2672,19 @@ qla82xx_start_scsi(srb_t *sp)
sufficient_dsds:
req_cnt = 1;
if (req->cnt < (req_cnt + 2)) {
cnt = (uint16_t)RD_REG_DWORD_RELAXED(
&reg->req_q_out[0]);
if (req->ring_index < cnt)
req->cnt = cnt - req->ring_index;
else
req->cnt = req->length -
(req->ring_index - cnt);
}
if (req->cnt < (req_cnt + 2))
goto queuing_error;
ctx = sp->ctx = mempool_alloc(ha->ctx_mempool, GFP_ATOMIC);
if (!sp->ctx) {
DEBUG(printk(KERN_INFO