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[SCSI] qla2xxx: Micro optimization in queuecommand handler

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Optimized queuecommand handler's to eliminate double head-room checks.
The checks are moved inside the 1st if-loop otherwise you would end up checking twice when there is
enough head room.

Signed-off-by: Chetan Loke <[email protected]>
Reviewed-by: Andrew Vasquez <[email protected]>
Reviewed-by: Giridhar Malavali <[email protected]>
Signed-off-by: Chad Dupuis <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
Chetan Loke 2012-05-15 14:34:09 -04:00 • committed by James Bottomley
commit a6eb3c9f73
1 changed files with 9 additions and 10 deletions
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19
drivers/scsi/qla2xxx/qla_iocb.c
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@ -385,9 +385,10 @@ qla2x00_start_scsi(srb_t *sp)
else
req->cnt = req->length -
(req->ring_index - cnt);
/* If still no head room then bail out */
if (req->cnt < (req_cnt + 2))
goto queuing_error;
}
if (req->cnt < (req_cnt + 2))
goto queuing_error;
/* Build command packet */
req->current_outstanding_cmd = handle;
@ -1502,9 +1503,9 @@ qla24xx_start_scsi(srb_t *sp)
else
req->cnt = req->length -
(req->ring_index - cnt);
if (req->cnt < (req_cnt + 2))
goto queuing_error;
}
if (req->cnt < (req_cnt + 2))
goto queuing_error;
/* Build command packet. */
req->current_outstanding_cmd = handle;
@ -1717,11 +1718,10 @@ qla24xx_dif_start_scsi(srb_t *sp)
else
req->cnt = req->length -
(req->ring_index - cnt);
if (req->cnt < (req_cnt + 2))
goto queuing_error;
}
if (req->cnt < (req_cnt + 2))
goto queuing_error;
status |= QDSS_GOT_Q_SPACE;
/* Build header part of command packet (excluding the OPCODE). */
@ -2343,11 +2343,10 @@ sufficient_dsds:
else
req->cnt = req->length -
(req->ring_index - cnt);
if (req->cnt < (req_cnt + 2))
goto queuing_error;
}
if (req->cnt < (req_cnt + 2))
goto queuing_error;
ctx = sp->u.scmd.ctx =
mempool_alloc(ha->ctx_mempool, GFP_ATOMIC);
if (!ctx) {