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IB/srp: Test only once whether iu allocation succeeded

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Merge the two tests in srp_queuecommand() of whether information unit
allocation succeeded into one.  An intended side effect of this change
is that we fix the warning:

    drivers/infiniband/ulp/srp/ib_srp.c: In function 'srp_queuecommand':
    drivers/infiniband/ulp/srp/ib_srp.c:1116: warning: 'req' may be used uninitialized in this function

(seen with CONFIG_CC_OPTIMIZE_FOR_SIZE=y at least with gcc 4.4.4)

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: David Dillow <dillowda@ornl.gov>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Bart Van Assche 2011-01-13 19:02:25 +00:00 committed by Roland Dreier
parent 4162cf6497
commit 695b83495e
1 changed files with 7 additions and 8 deletions
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15
drivers/infiniband/ulp/srp/ib_srp.c
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@ -1132,15 +1132,12 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
spin_lock_irqsave(&target->lock, flags);
iu = __srp_get_tx_iu(target, SRP_IU_CMD);
if (iu) {
req = list_first_entry(&target->free_reqs, struct srp_request,
list);
list_del(&req->list);
}
spin_unlock_irqrestore(&target->lock, flags);
if (!iu)
goto err;
goto err_unlock;
req = list_first_entry(&target->free_reqs, struct srp_request, list);
list_del(&req->list);
spin_unlock_irqrestore(&target->lock, flags);
dev = target->srp_host->srp_dev->dev;
ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
@ -1185,6 +1182,8 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
spin_lock_irqsave(&target->lock, flags);
list_add(&req->list, &target->free_reqs);
err_unlock:
spin_unlock_irqrestore(&target->lock, flags);
err: