[PATCH v5 09/23] scsi: sd: Do not issue commands to suspended disks on shutdown

[Damien Le Moal <dlemoal@kernel.org>]

If an error occurs when resuming a host adapter before the devices
attached to the adapter are resumed, the adapter low level driver may
remove the scsi host, resulting in a call to sd_remove() for the
disks of the host. This in turn results in a call to sd_shutdown() which
will issue a synchronize cache command and a start stop unit command to
spindown the disk. sd_shutdown() issues the commands only if the device
is not already suspended but does not check the power state for
system-wide suspend/resume. That is, the commands may be issued with the
device in a suspended state, which causes PM resume to hang, forcing a
reset of the machine to recover.

Fix this by not calling sd_shutdown() in sd_remove() if the device
is not running.

Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/scsi/sd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 1d106c8ad5af..d86306d42445 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3727,7 +3727,8 @@ static int sd_remove(struct device *dev)
 
 	device_del(&sdkp->disk_dev);
 	del_gendisk(sdkp->disk);
-	sd_shutdown(dev);
+	if (sdkp->device->sdev_state == SDEV_RUNNING)
+		sd_shutdown(dev);
 
 	put_disk(sdkp->disk);
 	return 0;
-- 
2.41.0