[PATCH v2] scsi: fix missing lock protection

[Chaohai Chen]

async_scan_lock is designed to protect the scanning_hosts list,
but there is no protection here.

Signed-off-by: Chaohai Chen <wdhh66@xxxxxxx>
---
 drivers/scsi/scsi_scan.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 96d7e1a9a7c7..4833b8fe251b 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -151,8 +151,9 @@ int scsi_complete_async_scans(void)
 	struct async_scan_data *data;
 
 	do {
-		if (list_empty(&scanning_hosts))
-			return 0;
+		scoped_guard(spinlock, &async_scan_lock)
+			if (list_empty(&scanning_hosts))
+				return 0;
 		/* If we can't get memory immediately, that's OK.  Just
 		 * sleep a little.  Even if we never get memory, the async
 		 * scans will finish eventually.
-- 
2.34.1