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| author | Qi Liu <liuqi115@huawei.com> | 2021-12-15 22:37:38 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-12-16 22:59:57 -0500 |
| commit | 20c634932ae8978435645b466c99b3fc1a80545a (patch) | |
| tree | 37f9f47a87c8ba5fde57256dbafc3bba64eaa182 | |
| parent | dc313f6b125b095d3d2683d94d5f69c8dc9bdc36 (diff) | |
| download | linux-20c634932ae8978435645b466c99b3fc1a80545a.tar.bz2 | |
scsi: hisi_sas: Prevent parallel controller reset and control phy command
A user may issue a control phy command from sysfs at any time, even if the
controller is resetting.
If a phy is disabled by hardreset/linkreset command before calling
get_phys_state() in the reset path, the saved phy state may be incorrect.
To avoid incorrectly recording the phy state, use hisi_hba.sem to ensure
that the controller reset may not run at the same time as when the phy
control function is running.
Link: https://lore.kernel.org/r/1639579061-179473-6-git-send-email-john.garry@huawei.com
Signed-off-by: Qi Liu <liuqi115@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/hisi_sas/hisi_sas_main.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index 8df1fd680eac..977911580d8f 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -1148,6 +1148,7 @@ static int hisi_sas_control_phy(struct asd_sas_phy *sas_phy, enum phy_func func, u8 sts = phy->phy_attached; int ret = 0; + down(&hisi_hba->sem); phy->reset_completion = &completion; switch (func) { @@ -1191,6 +1192,7 @@ static int hisi_sas_control_phy(struct asd_sas_phy *sas_phy, enum phy_func func, out: phy->reset_completion = NULL; + up(&hisi_hba->sem); return ret; } |