scsi: hisi_sas: save delivery queue write pointer

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Optimise by saving an avoidable read in the get_free_slot function.  The
delivery queue write pointer will only be updated by software, so don't
bother re-reading what was already written in the previous call to
start_delivery function.

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 23:36:12 +08:00 • committed by Martin K. Petersen

parent e6c346f303

commit 4fde02ad66

4 changed files with 25 additions and 8 deletions

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7

drivers/scsi/hisi_sas/hisi_sas.h

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5

drivers/scsi/hisi_sas/hisi_sas_main.c

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12

drivers/scsi/hisi_sas/hisi_sas_v1_hw.c

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9

drivers/scsi/hisi_sas/hisi_sas_v2_hw.c

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