[PATCH 5.15 033/177] btrfs: remove stale comment about the btrfs_show_devname

Greg Kroah-Hartman
2021-12-20T15:10:41Z

From: Anand Jain <anand.jain@oracle.com>

Commit cdccc03a8a369b59cff5e7ea3292511cfa551120 upstream.

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>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/btrfs/volumes.c | 7 -------
1 file changed, 7 deletions(-)

--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2312,13 +2312,6 @@ void btrfs_destroy_dev_replace_tgtdev(st

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);