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[PATCH 1/1] btrfs: volumes: fix improper return value

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  [PATCH 1/1] btrfs: volumes: fix improper return value Pan Bian <bianpan2016@163.com> - 2016-12-03 12:40 +0100
    Re: [PATCH 1/1] btrfs: volumes: fix improper return value Omar Sandoval <osandov@osandov.com> - 2016-12-03 19:40 +0100

#1535382 — [PATCH 1/1] btrfs: volumes: fix improper return value

Variable ret takes the errno on failures. However, it directly returns 0.
It may be better to return "ret".

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188741

Signed-off-by: Pan Bian <bianpan2016@163.com>
---
 fs/btrfs/volumes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 71a60cc..32fd903 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4222,7 +4222,7 @@ static int btrfs_uuid_scan_kthread(void *data)
 	else
 		set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags);
 	up(&fs_info->uuid_tree_rescan_sem);
-	return 0;
+	return ret;
 }
 
 /*
-- 
1.9.1

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#1535481

On Sat, Dec 03, 2016 at 07:01:45PM +0800, Pan Bian wrote:
> Variable ret takes the errno on failures. However, it directly returns 0.
> It may be better to return "ret".
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188741
> 
> Signed-off-by: Pan Bian <bianpan2016@163.com>
> ---
>  fs/btrfs/volumes.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 71a60cc..32fd903 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -4222,7 +4222,7 @@ static int btrfs_uuid_scan_kthread(void *data)
>  	else
>  		set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags);
>  	up(&fs_info->uuid_tree_rescan_sem);
> -	return 0;
> +	return ret;

This is a kthread, no one checks the return value. We already let the
user know if it fails:

	btrfs_warn(fs_info, "btrfs_uuid_scan_kthread failed %d", ret);

>  }
>  
>  /*
> -- 
> 1.9.1
> 
> 
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