linux-kernel - Re: [PATCH v2 1/4] pstore/blk: Improve failure reporting

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Date:   Wed, 16 Jun 2021 05:51:10 +0200
From:   Christoph Hellwig <hch@....de>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Al Viro <viro@...iv.linux.org.uk>, gmpy.liaowx@...il.com,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        Jonathan Corbet <corbet@....net>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-doc@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] pstore/blk: Improve failure reporting

On Tue, Jun 15, 2021 at 02:21:18PM -0700, Kees Cook wrote:
> -	if (!dev || !dev->total_size || !dev->read || !dev->write)
> +	if (!dev || !dev->total_size || !dev->read || !dev->write) {
> +		if (!dev)
> +			pr_err("NULL device info\n");
> +		else {
> +			if (!dev->total_size)
> +				pr_err("zero sized device\n");
> +			if (!dev->read)
> +				pr_err("no read handler for device\n");
> +			if (!dev->write)
> +				pr_err("no write handler for device\n");
> +		}
>  		return -EINVAL;
> +	}

I still find this style of checks pretty strange..