scsi: hisi_sas: save completion queue read pointer

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Optimise by saving an avoidable read in the cq interrupt.  The queue
read pointer will only be updated by software, so don't bother
re-reading what was already written in the previous interrupt.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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John Garry 2016-09-06 23:36:11 +08:00 • committed by Martin K. Petersen

parent c4a11827b7

commit e6c346f303

3 changed files with 5 additions and 7 deletions

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1

drivers/scsi/hisi_sas/hisi_sas.h

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6

drivers/scsi/hisi_sas/hisi_sas_v1_hw.c

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5

drivers/scsi/hisi_sas/hisi_sas_v2_hw.c

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