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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     lijinlin <lijinlin3@huawei.com>,
        Bart Van Assche <bvanassche@acm.org>,
        Wu Bo <wubo40@huawei.com>,
        "Martin K . Petersen" <martin.petersen@oracle.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.10 26/98] scsi: core: Fix capacity set to zero after offlinining device
Date:   Tue, 24 Aug 2021 12:57:56 -0400
Message-Id: <20210824165908.709932-27-sashal@kernel.org>
In-Reply-To: <20210824165908.709932-1-sashal@kernel.org>
References: <20210824165908.709932-1-sashal@kernel.org>
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From: lijinlin <lijinlin3@huawei.com>

[ Upstream commit f0f82e2476f6adb9c7a0135cfab8091456990c99 ]

After adding physical volumes to a volume group through vgextend, the
kernel will rescan the partitions. This in turn will cause the device
capacity to be queried.

If the device status is set to offline through sysfs at this time, READ
CAPACITY command will return a result which the host byte is
DID_NO_CONNECT, and the capacity of the device will be set to zero in
read_capacity_error(). After setting device status back to running, the
capacity of the device will remain stuck at zero.

Fix this issue by rescanning device when the device state changes to
SDEV_RUNNING.

Link: https://lore.kernel.org/r/20210727034455.1494960-1-lijinlin3@huawei.com
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: lijinlin <lijinlin3@huawei.com>
Signed-off-by: Wu Bo <wubo40@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/scsi_sysfs.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index d6e344fa33ad..4dcced95c8b4 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -807,11 +807,14 @@ store_state_field(struct device *dev, struct device_attribute *attr,
 	mutex_lock(&sdev->state_mutex);
 	ret = scsi_device_set_state(sdev, state);
 	/*
-	 * If the device state changes to SDEV_RUNNING, we need to run
-	 * the queue to avoid I/O hang.
+	 * If the device state changes to SDEV_RUNNING, we need to
+	 * rescan the device to revalidate it, and run the queue to
+	 * avoid I/O hang.
 	 */
-	if (ret == 0 && state == SDEV_RUNNING)
+	if (ret == 0 && state == SDEV_RUNNING) {
+		scsi_rescan_device(dev);
 		blk_mq_run_hw_queues(sdev->request_queue, true);
+	}
 	mutex_unlock(&sdev->state_mutex);
 
 	return ret == 0 ? count : -EINVAL;
-- 
2.30.2