[PATCH] Avoid that a kernel warning appears during system resume

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Since scsi_device_quiesce() skips SCSI devices that have another state
than RUNNING, OFFLINE or TRANSPORT_OFFLINE, scsi_device_resume() should
not complain about SCSI devices that have been skipped. Hence this patch.
This patch avoids that the following warning appears during resume:

WARNING: CPU: 3 PID: 1039 at blk_clear_pm_only+0x2a/0x30
CPU: 3 PID: 1039 Comm: kworker/u8:49 Not tainted 5.0.0+ #1
Hardware name: LENOVO 4180F42/4180F42, BIOS 83ET75WW (1.45 ) 05/10/2013
Workqueue: events_unbound async_run_entry_fn
RIP: 0010:blk_clear_pm_only+0x2a/0x30
Call Trace:
 ? scsi_device_resume+0x28/0x50
 ? scsi_dev_type_resume+0x2b/0x80
 ? async_run_entry_fn+0x2c/0xd0
 ? process_one_work+0x1f0/0x3f0
 ? worker_thread+0x28/0x3c0
 ? process_one_work+0x3f0/0x3f0
 ? kthread+0x10c/0x130
 ? __kthread_create_on_node+0x150/0x150
 ? ret_from_fork+0x1f/0x30

Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
Cc: Johannes Thumshirn <jthumshirn@xxxxxxx>
Cc: Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx>
Cc: Martin Steigerwald <martin@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Reported-by: Jisheng Zhang <Jisheng.Zhang@xxxxxxxxxxxxx>
Tested-by: Jisheng Zhang <Jisheng.Zhang@xxxxxxxxxxxxx>
Fixes: 3a0a529971ec ("block, scsi: Make SCSI quiesce and resume work reliably") # v4.15
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
 drivers/scsi/scsi_lib.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 324f830ee9fa..54ad751b42b8 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2541,8 +2541,10 @@ void scsi_device_resume(struct scsi_device *sdev)
 	 * device deleted during suspend)
 	 */
 	mutex_lock(&sdev->state_mutex);
-	sdev->quiesced_by = NULL;
-	blk_clear_pm_only(sdev->request_queue);
+	if (sdev->quiesced_by) {
+		sdev->quiesced_by = NULL;
+		blk_clear_pm_only(sdev->request_queue);
+	}
 	if (sdev->sdev_state == SDEV_QUIESCE)
 		scsi_device_set_state(sdev, SDEV_RUNNING);
 	mutex_unlock(&sdev->state_mutex);
-- 
2.21.0.155.ge902e9bcae20




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