[PATCH v2] btrfs: sysfs: check initialization state before updating features

[David Sterba <dsterba@suse.com>]

If the mount phase is not finished, we can't update the sysfs files.

Reported-by: Chris Mason <clm@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
v2: fix compilation error

 fs/btrfs/sysfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 6986886243bf..539e7b5e3f86 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -804,6 +804,9 @@ void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
 	fs_devs = fs_info->fs_devices;
 	fsid_kobj = &fs_devs->fsid_kobj;
 
+	if (!fsid_kobj->state_initialized)
+		return;
+
 	/*
 	 * FIXME: this is too heavy to update just one value, ideally we'd like
 	 * to use sysfs_update_group but some refactoring is needed first.
-- 
1.8.4.5