From: Christoph Hellwig <hch@lst.de>
Date: Wed, 26 Mar 2014 09:35:00 +0000 (+0100)
Subject: scsi: only maintain target_blocked if the driver has a target queue limit
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~143^2~84
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2ccbb00808465338b57c39f38c0b1e7ce69e2bb1;p=pandora-kernel.git

scsi: only maintain target_blocked if the driver has a target queue limit

This saves us an atomic operation for each I/O submission and completion
for the usual case where the driver doesn't set a per-target can_queue
value.  Only a few iscsi hardware offload drivers set the per-target
can_queue value at the moment.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Webb Scales <webbnh@hp.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Tested-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Robert Elliott <elliott@hp.com>
---

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