linux-ext4 - Re: [PATCH linux] ext4: Delete useless ret assignment

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Message-ID: <YdZzt0LF/ajTGNXo@mit.edu>
Date:   Wed, 5 Jan 2022 23:44:39 -0500
From:   "Theodore Ts'o" <tytso@....edu>
To:     cgel.zte@...il.com
Cc:     Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        luo penghao <luo.penghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>,
        Harshad Shirwadkar <harshadshirwadkar@...il.com>
Subject: Re: [PATCH linux] ext4: Delete useless ret assignment

On Thu, Dec 30, 2021 at 06:29:05AM +0000, cgel.zte@...il.com wrote:
> From: luo penghao <luo.penghao@....com.cn>
> 
> The assignments in these two places will be overwritten by new
> assignments later, so they should be deleted.
> 
> The clang_analyzer complains as follows:
> 
> fs/ext4/fast_commit.c
> 
> Value stored to 'ret' is never read

I suspect the right answer here is that we *should* be checking the
return value, and reflecting the error up to caller, if appropriate.

Harshad, what do you think?

					- Ted

> 
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: luo penghao <luo.penghao@....com.cn>
> ---
>  fs/ext4/fast_commit.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
> index 8ea5a81..8d5d044 100644
> --- a/fs/ext4/fast_commit.c
> +++ b/fs/ext4/fast_commit.c
> @@ -1660,7 +1660,7 @@ static int ext4_fc_replay_add_range(struct super_block *sb,
>  		return 0;
>  	}
>  
> -	ret = ext4_fc_record_modified_inode(sb, inode->i_ino);
> +	ext4_fc_record_modified_inode(sb, inode->i_ino);
>  
>  	start = le32_to_cpu(ex->ee_block);
>  	start_pblk = ext4_ext_pblock(ex);
> @@ -1785,7 +1785,7 @@ ext4_fc_replay_del_range(struct super_block *sb, struct ext4_fc_tl *tl,
>  		return 0;
>  	}
>  
> -	ret = ext4_fc_record_modified_inode(sb, inode->i_ino);
> +	ext4_fc_record_modified_inode(sb, inode->i_ino);
>  
>  	jbd_debug(1, "DEL_RANGE, inode %ld, lblk %d, len %d\n",
>  			inode->i_ino, le32_to_cpu(lrange.fc_lblk),
> -- 
> 2.15.2
> 
>