diff options
| -rw-r--r-- | fs/super.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/super.c b/fs/super.c index 938119ab8dc..3479ca6f005 100644 --- a/fs/super.c +++ b/fs/super.c @@ -773,7 +773,16 @@ int get_sb_bdev(struct file_system_type *fs_type, goto error_bdev; } + /* + * s_umount nests inside bd_mutex during + * __invalidate_device(). close_bdev_exclusive() + * acquires bd_mutex and can't be called under + * s_umount. Drop s_umount temporarily. This is safe + * as we're holding an active reference. + */ + up_write(&s->s_umount); close_bdev_exclusive(bdev, mode); + down_write(&s->s_umount); } else { char b[BDEVNAME_SIZE]; |