linux-kernel - [PATCH AUTOSEL 4.20 227/304] scsi: smartpqi: correct volume status

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Message-Id: <20190128154341.47195-227-sashal@kernel.org>
Date:   Mon, 28 Jan 2019 10:42:24 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dave Carroll <david.carroll@...rosemi.com>,
        Don Brace <don.brace@...rosemi.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>, esc.storagedev@...rosemi.com,
        linux-scsi@...r.kernel.org
Subject: [PATCH AUTOSEL 4.20 227/304] scsi: smartpqi: correct volume status

From: Dave Carroll <david.carroll@...rosemi.com>

[ Upstream commit 7ff44499bafbd376115f0bb6b578d980f56ee13b ]

- fix race condition when a unit is deleted after an RLL,
  and before we have gotten the LV_STATUS page of the unit.
  - In this case we will get a standard inquiry, rather than
    the desired page.  This will result in a unit presented
    which no longer exists.
  - If we ask for LV_STATUS, insure we get LV_STATUS

Reviewed-by: Murthy Bhat <murthy.bhat@...rosemi.com>
Reviewed-by: Mahesh Rajashekhara <mahesh.rajashekhara@...rosemi.com>
Reviewed-by: Scott Teel <scott.teel@...rosemi.com>
Reviewed-by: Kevin Barnett <kevin.barnett@...rosemi.com>
Signed-off-by: Dave Carroll <david.carroll@...rosemi.com>
Signed-off-by: Don Brace <don.brace@...rosemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/smartpqi/smartpqi_init.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 5a86dddbd8ba..489e5cbbcbba 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -1168,6 +1168,9 @@ static void pqi_get_volume_status(struct pqi_ctrl_info *ctrl_info,
 	if (rc)
 		goto out;
 
+	if (vpd->page_code != CISS_VPD_LV_STATUS)
+		goto out;
+
 	page_length = offsetof(struct ciss_vpd_logical_volume_status,
 		volume_status) + vpd->page_length;
 	if (page_length < sizeof(*vpd))
-- 
2.19.1