On 2018/1/2 21:50, John Garry wrote:
On 02/01/2018 12:15, Jason Yan wrote:
The intend purpose here was to goto out if smp_execute_task() returned
error. Obviously something got screwed up. We will never get these link
error statistics below:
~:/sys/class/sas_phy/phy-1:0:12 # cat invalid_dword_count
0
~:/sys/class/sas_phy/phy-1:0:12 # cat running_disparity_error_count
0
~:/sys/class/sas_phy/phy-1:0:12 # cat loss_of_dword_sync_count
0
~:/sys/class/sas_phy/phy-1:0:12 # cat phy_reset_problem_count
0
Obviously we should goto error handler if smp_execute_task() returns
non-zero.
Signed-off-by: Jason Yan
CC: John Garry
CC: chenqilin
CC: chenxiang
---
drivers/scsi/libsas/sas_expander.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/libsas/sas_expander.c
b/drivers/scsi/libsas/sas_expander.c
index 4b0c67f..6eab487 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -686,7 +686,7 @@ int sas_smp_get_phy_events(struct sas_phy *phy)
res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
resp, RPEL_RESP_SIZE);
-if (!res)
+if (res)
goto out;
This seems to have been broken for some time.
Could you inject some errors on the link to verify that this function
actually works properly with this change, i.e. non-zero reading?
Thanks,
John
Yes, I have tested it. Before we fix, they are all zero. After we fix
it and do some test:
localhost:/sys/class/sas_phy/phy-1:0:1 #
localhost:/sys/class/sas_phy/phy-1:0:1 # cat invalid_dword_count
22
localhost:/sys/class/sas_phy/phy-1:0:1 # cat phy_reset_problem_count
1
localhost:/sys/class/sas_phy/phy-1:0:1 # cat running_disparity_error_count
23
localhost:/sys/class/sas_phy/phy-1:0:1 # cat loss_of_dword_sync_count
1
localhost:/sys/class/sas_phy/phy-1:0:1 #
phy->invalid_dword_count = scsi_to_u32(&resp[12]);
.
