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Date:   Tue, 22 Jan 2019 15:29:33 -0800
From:   Omar Sandoval <osandov@osandov.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-kernel@vger.kernel.org, "Ed L. Cashin" <ed.cashin@acm.org>,
        Jens Axboe <axboe@kernel.dk>, linux-block@vger.kernel.org
Subject: Re: [PATCH] block: aoe: no need to check return value of
 debugfs_create functions
Message-ID: <20190122232933.GC5884@vader>
References: <20190122152151.16139-5-gregkh@linuxfoundation.org>
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On Tue, Jan 22, 2019 at 04:21:04PM +0100, Greg Kroah-Hartman wrote:
> When calling debugfs functions, there is no need to ever check the
> return value.  The function can work or not, but the code logic should
> never do something different based on this.
> 
> Cc: "Ed L. Cashin" <ed.cashin@acm.org>
> Cc: Jens Axboe <axboe@kernel.dk>
> Cc: linux-block@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  drivers/block/aoe/aoeblk.c | 13 +------------
>  1 file changed, 1 insertion(+), 12 deletions(-)
> 
> diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
> index e2c6aae2d636..b602646bfa04 100644
> --- a/drivers/block/aoe/aoeblk.c
> +++ b/drivers/block/aoe/aoeblk.c
> @@ -207,14 +207,7 @@ aoedisk_add_debugfs(struct aoedev *d)
>  	else
>  		p++;
>  	BUG_ON(*p == '\0');
> -	entry = debugfs_create_file(p, 0444, aoe_debugfs_dir, d,
> -				    &aoe_debugfs_fops);
> -	if (IS_ERR_OR_NULL(entry)) {
> -		pr_info("aoe: cannot create debugfs file for %s\n",
> -			d->gd->disk_name);
> -		return;
> -	}
> -	BUG_ON(d->debugfs);
> +	debugfs_create_file(p, 0444, aoe_debugfs_dir, d, &aoe_debugfs_fops);
>  	d->debugfs = entry;

Now entry is uninitialized here when we assign it to d->debugfs.

>  }
>  void
> @@ -472,10 +465,6 @@ aoeblk_init(void)
>  	if (buf_pool_cache == NULL)
>  		return -ENOMEM;
>  	aoe_debugfs_dir = debugfs_create_dir("aoe", NULL);
> -	if (IS_ERR_OR_NULL(aoe_debugfs_dir)) {
> -		pr_info("aoe: cannot create debugfs directory\n");
> -		aoe_debugfs_dir = NULL;
> -	}
>  	return 0;
>  }
>  
> -- 
> 2.20.1
>