[PATCH 2/9] loop: reduce loop_ctl_mutex coverage in loop_exit

[Christoph Hellwig <hch@xxxxxx>]

loop_ctl_mutex is only needed to iterate the IDR for removing the loop
devices, so reduce the coverage.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
---
 drivers/block/loop.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 44fa27c54ac2..9df9fb490f87 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -2380,13 +2380,14 @@ static int loop_exit_cb(int id, void *ptr, void *data)
 
 static void __exit loop_exit(void)
 {
-	mutex_lock(&loop_ctl_mutex);
 	unregister_blkdev(LOOP_MAJOR, "loop");
 	misc_deregister(&loop_misc);
 
+	mutex_lock(&loop_ctl_mutex);
 	idr_for_each(&loop_index_idr, &loop_exit_cb, NULL);
-	idr_destroy(&loop_index_idr);
 	mutex_unlock(&loop_ctl_mutex);
+
+	idr_destroy(&loop_index_idr);
 }
 
 module_init(loop_init);
-- 
2.30.2