diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index bcc0acda86910de915fe6a01a318f7b5a8a42d75..be2d4e0e6cfbc2946796c12e8c120c8f72286b96 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2987,7 +2987,7 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
 	key.offset = (u64)-1;
 	key.type = BTRFS_DEV_EXTENT_KEY;
 
-	while (1) {
+	do {
 		ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
 		if (ret < 0)
 			goto done;
@@ -3029,8 +3029,7 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
 			goto done;
 		if (ret == -ENOSPC)
 			failed++;
-		key.offset -= 1;
-	}
+	} while (key.offset-- > 0);
 
 	if (failed && !retried) {
 		failed = 0;