[PATCH v1 2/2] block: loop: restore state on loop_configure() error

["Iván Ezequiel Rodriguez" <ivanrwcm25@gmail.com>]

On failure after loop_assign_backing_file(), restore the backing
file GFP mask, clear lo_backing_file/lo_device, and re-enable uevents
before unlocking and dropping the file reference.

Signed-off-by: Iván Ezequiel Rodriguez <ivanrwcm25@gmail.com>
---
 drivers/block/loop.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 6f12976035b0..838554bd980e 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1123,6 +1123,13 @@ static int loop_configure(struct loop_device *lo, blk_mode_t mode,
 	return 0;
 
 out_unlock:
+	if (lo->lo_backing_file) {
+		mapping_set_gfp_mask(lo->lo_backing_file->f_mapping,
+				     lo->old_gfp_mask);
+		lo->lo_backing_file = NULL;
+		lo->lo_device = NULL;
+	}
+	dev_set_uevent_suppress(disk_to_dev(lo->lo_disk), 0);
 	loop_global_unlock(lo, is_loop);
 out_bdev:
 	if (!(mode & BLK_OPEN_EXCL))
-- 
2.43.0