scsi_device_quiesce() and scsi_device_resume() are called during
system-wide suspend and resume. scsi_device_quiesce() only succeeds
for SCSI devices that are in one of the RUNNING, OFFLINE or
TRANSPORT_OFFLINE states (see also scsi_set_device_state()).
This patch avoids that the following warning is triggered when
resuming a system for which quiescing a SCSI device failed:
WARNING: CPU: 2 PID: 11303 at drivers/scsi/scsi_lib.c:2600 scsi_device_resume+0x4f/0x58
CPU: 2 PID: 11303 Comm: kworker/u8:70 Not tainted 5.0.0-rc1+ #50
Hardware name: LENOVO 80E3/Lancer 5B2, BIOS A2CN45WW(V2.13) 08/04/2016
Workqueue: events_unbound async_run_entry_fn
Call Trace:
scsi_dev_type_resume+0x2e/0x60
async_run_entry_fn+0x32/0xd8
process_one_work+0x1f4/0x420
worker_thread+0x28/0x3c0
kthread+0x118/0x130
ret_from_fork+0x22/0x40
Cc: Przemek Socha <soprwa@xxxxxxxxx>
Reported-by: Przemek Socha <soprwa@xxxxxxxxx>
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 | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index c77cb0d31dbc..c73045a5f739 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2541,7 +2541,6 @@ void scsi_device_resume(struct scsi_device *sdev)
* device deleted during suspend)
*/
mutex_lock(&sdev->state_mutex);
- WARN_ON_ONCE(!sdev->quiesced_by);
sdev->quiesced_by = NULL;
blk_clear_pm_only(sdev->request_queue);
if (sdev->sdev_state == SDEV_QUIESCE)
--
2.21.0.rc2.261.ga7da99ff1b-goog
