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

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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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This commit is contained in:

Christoph Hellwig 2014-03-26 10:35:00 +01:00

parent cd9070c9c5

commit 2ccbb00808

1 changed files with 18 additions and 10 deletions

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drivers/scsi/scsi_lib.c

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