linux-kernel - [PATCH 3.2 037/153] scsi: libsas: fix error when getting phy events

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Date:   Wed, 30 May 2018 11:52:41 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "chenxiang" <chenxiang66@...ilicon.com>,
        "Christoph Hellwig" <hch@....de>,
        "John Garry" <john.garry@...wei.com>,
        "Jason Yan" <yanaijie@...wei.com>,
        "chenqilin" <chenqilin2@...wei.com>,
        "Hannes Reinecke" <hare@...e.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 3.2 037/153] scsi: libsas: fix error when getting phy events

3.2.102-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jason Yan <yanaijie@...wei.com>

commit 2b23d9509fd7174b362482cf5f3b5f9a2265bc33 upstream.

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.

Fixes: 2908d778ab3e ("[SCSI] aic94xx: new driver")
Signed-off-by: Jason Yan <yanaijie@...wei.com>
CC: John Garry <john.garry@...wei.com>
CC: chenqilin <chenqilin2@...wei.com>
CC: chenxiang <chenxiang66@...ilicon.com>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/scsi/libsas/sas_expander.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -557,7 +557,7 @@ int sas_smp_get_phy_events(struct sas_ph
 	res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 			            resp, RPEL_RESP_SIZE);
 
-	if (!res)
+	if (res)
 		goto out;
 
 	phy->invalid_dword_count = scsi_to_u32(&resp[12]);