This is already done in btrfs_init_dev_replace_tgtdev which is the first
phase of device replace, called before doing scrub. During that time
exclusive lock is held. Additionally btrfs_fs_device::commit_total_bytes
is always set based on the size of the underlying block device which
shouldn't change once set. This makes the 2nd assignment of the variable
in the finishing phase redundant.

Signed-off-by: Nikolay Borisov <nbori...@suse.com>
---
 fs/btrfs/dev-replace.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 8ec9328609bd..5005a03ba847 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -669,7 +669,6 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info 
*fs_info,
        btrfs_device_set_disk_total_bytes(tgt_device,
                                          src_device->disk_total_bytes);
        btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used);
-       tgt_device->commit_total_bytes = src_device->commit_total_bytes;
        tgt_device->commit_bytes_used = src_device->bytes_used;
 
        btrfs_assign_next_active_device(src_device, tgt_device);
-- 
2.17.1

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