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(parent: c4a1182) | patch
scsi: hisi_sas: save completion queue read pointer
authorJohn Garry <john.garry@huawei.com>
Tue, 6 Sep 2016 15:36:11 +0000 (23:36 +0800)
committerMartin K. Petersen <martin.petersen@oracle.com>
Wed, 14 Sep 2016 16:54:17 +0000 (12:54 -0400)
commite6c346f303d41b8799ea224d0faf1b2caa1c98db
tree5ab81caef92f48c4960acefc2e66605b2e05eab4tree | snapshot
parentc4a11827b760ef8dcda26b5731d072b1d8fb7c81commit | diff
scsi: hisi_sas: save completion queue read pointer

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>
drivers/scsi/hisi_sas/hisi_sas.h diff | blob | history
drivers/scsi/hisi_sas/hisi_sas_v1_hw.c diff | blob | history
drivers/scsi/hisi_sas/hisi_sas_v2_hw.c diff | blob | history
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