btrfs: remove stale comment about the btrfs_show_devname

There were few lockdep warnings because btrfs_show_devname() was using
device_list_mutex as recorded in the commits:

  0ccd05285e7f ("btrfs: fix a possible umount deadlock")
  779bf3fefa83 ("btrfs: fix lock dep warning, move scratch dev out of device_list_mutex and uuid_mutex")

And finally, commit 88c14590cdd6 ("btrfs: use RCU in btrfs_show_devname
for device list traversal") removed the device_list_mutex from
btrfs_show_devname for performance reasons.

This patch removes a stale comment about the function
btrfs_show_devname and device_list_mutex.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 05eedab5ff1569710e12e9a0bb93fc315a5f58ad..2101a5bd4eba8b389bb3760bf67b8ed78c1fffca 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2305,13 +2305,6 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev)
 
        mutex_unlock(&fs_devices->device_list_mutex);
 
-       /*
-        * The update_dev_time() with in btrfs_scratch_superblocks()
-        * may lead to a call to btrfs_show_devname() which will try
-        * to hold device_list_mutex. And here this device
-        * is already out of device list, so we don't have to hold
-        * the device_list_mutex lock.
-        */
        btrfs_scratch_superblocks(tgtdev->fs_info, tgtdev->bdev,
                                  tgtdev->name->str);