btrfs: use device_list_mutex when removing stale devices
btrfs_free_stale_devices() finds a stale (not opened) device matching path in the fs_uuid list. We are already under uuid_mutex so when we check for each fs_devices, hold the device_list_mutex too. Signed-off-by: NAnand Jain <anand.jain@oracle.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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