diff options
| author | John Garry <john.garry@huawei.com> | 2022-05-17 16:04:21 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2022-05-19 20:16:26 -0400 |
| commit | 6c6ac8b7773f05f93dc4e4044686e059d1f78dea (patch) | |
| tree | 28fc4dca36f45be30dc008ba376cd93f3e5be83e /tools/perf/scripts/python/net_dropmonitor.py | |
| parent | b559b99a5c08194c14dc271e69ca786771b353dc (diff) | |
scsi: hisi_sas: Fix memory ordering in hisi_sas_task_deliver()
The memories for the slot should be observed to be written prior to
observing the slot as ready.
Prior to commit 26fc0ea74fcb ("scsi: libsas: Drop SAS_TASK_AT_INITIATOR"),
we had a spin_lock() + spin_unlock() immediately before marking the slot as
ready. The spin_unlock() - with release semantics - caused the slot memory
to be observed to be written.
Now that the spin_lock() + spin_unlock() is gone, use a smp_wmb().
Link: https://lore.kernel.org/r/1652774661-12935-1-git-send-email-john.garry@huawei.com
Fixes: 26fc0ea74fcb ("scsi: libsas: Drop SAS_TASK_AT_INITIATOR")
Reported-by: Yihang Li <liyihang6@hisilicon.com>
Tested-by: Yihang Li <liyihang6@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'tools/perf/scripts/python/net_dropmonitor.py')
0 files changed, 0 insertions, 0 deletions