scsi: hisi_sas: Don't bother clearing status buffer IU in task prep

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For struct hisi_sas_status_buffer, it contains struct hisi_sas_err_record
and iu[1024]. The struct iu[1024] will be filled fully by the response of
disks, so it is not need to initialize them to 0, but for the struct
hisi_sas_err_record, SAS controller only fill some fields of
hisi_sas_err_record according to hw designer, so it should be initialised
to 0.  After the change, cpu utilization percentage of memset() is changed
from 1.7% to 0.12%.

Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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Xiang Chen 2019-08-05 21:48:04 +08:00 • committed by Martin K. Petersen

parent 445ee2de11

commit d380f55503

1 changed files with 4 additions and 2 deletions

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drivers/scsi/hisi_sas/hisi_sas_main.c

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