diff options
| author | Chetan Loke <loke.chetan@gmail.com> | 2012-05-15 18:34:09 (GMT) |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-05-22 10:12:47 (GMT) |
| commit | a6eb3c9f73deaa318f17a19c7ad012b3ebe750c3 (patch) | |
| tree | 686ce06b73984e2364f633d105de8f60546991bc /drivers/scsi/qla2xxx/qla_iocb.c | |
| parent | 9e336520c5f673d911642035a5d84fa331ff127f (diff) | |
| download | linux-a6eb3c9f73deaa318f17a19c7ad012b3ebe750c3.tar.xz | |
[SCSI] qla2xxx: Micro optimization in queuecommand handler
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 <loke.chetan@gmail.com>
Reviewed-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Reviewed-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/qla2xxx/qla_iocb.c')
| -rw-r--r-- | drivers/scsi/qla2xxx/qla_iocb.c | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/drivers/scsi/qla2xxx/qla_iocb.c b/drivers/scsi/qla2xxx/qla_iocb.c index eac9509..1ae0d1d 100644 --- a/drivers/scsi/qla2xxx/qla_iocb.c +++ b/drivers/scsi/qla2xxx/qla_iocb.c @@ -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) { |