[PATCH 4.9 40/42] scsi: core: Only put parent device if host state differs from SHOST_CREATED

[Greg Kroah-Hartman]

From: Ming Lei <ming.lei@xxxxxxxxxx>

commit 1e0d4e6225996f05271de1ebcb1a7c9381af0b27 upstream.

get_device(shost->shost_gendev.parent) is called after host state has
switched to SHOST_RUNNING. scsi_host_dev_release() shouldn't release the
parent device if host state is still SHOST_CREATED.

Link: https://lore.kernel.org/r/20210602133029.2864069-5-ming.lei@xxxxxxxxxx
Cc: Bart Van Assche <bvanassche@xxxxxxx>
Cc: John Garry <john.garry@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Tested-by: John Garry <john.garry@xxxxxxxxxx>
Reviewed-by: John Garry <john.garry@xxxxxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/scsi/hosts.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -368,7 +368,7 @@ static void scsi_host_dev_release(struct
 
 	ida_simple_remove(&host_index_ida, shost->host_no);
 
-	if (parent)
+	if (shost->shost_state != SHOST_CREATED)
 		put_device(parent);
 	kfree(shost);
 }