linux-kernel - Re: [PATCH] GFS2: Return -ENOMEM only if kmalloc fails

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Date:	Thu, 26 Apr 2012 23:14:02 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Emil Goode <emilgoode@...il.com>
Cc:	swhiteho@...hat.com, cluster-devel@...hat.com,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] GFS2: Return -ENOMEM only if kmalloc fails

Am Donnerstag, 26. April 2012, 23:12:58 schrieb Emil Goode:
> The error variable should be assigned the value of -ENOMEM
> after the NULL check and not before.
> 
> Signed-off-by: Emil Goode <emilgoode@...il.com>
> ---
>  fs/gfs2/acl.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
> index 230eb0f..90f6328 100644
> --- a/fs/gfs2/acl.c
> +++ b/fs/gfs2/acl.c
> @@ -174,8 +174,8 @@ int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
>  
>  	len = posix_acl_to_xattr(acl, NULL, 0);
>  	data = kmalloc(len, GFP_NOFS);
> -	error = -ENOMEM;
>  	if (data == NULL)
> +		error = -ENOMEM;
>  		goto out;

Hint: read about the syntax of the if statement.
Secondly, consider how the compiler can optimize the original.

	Regards
		Oliver
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