commit 4fde02ad66dc9ceb0b55daca21ef33b43df30ded
author John Garry <john.garry@huawei.com> Tue Sep 06 23:36:12 2016 +0800
committer Martin K. Petersen <martin.petersen@oracle.com> Wed Sep 14 12:54:17 2016 -0400
tree 4c707c92f64c6c18bfaa4dd62c6e24f70fc0abbd
parent e6c346f303d41b8799ea224d0faf1b2caa1c98db

scsi: hisi_sas: save delivery queue write pointer

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>