linux-kernel - Re: [PATCH] nvme-multipath: combine grpid and ANA state checks in nvme_parse_ana

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Date:   Tue, 8 Jun 2021 07:23:20 +0200
From:   Christoph Hellwig <hch@....de>
To:     Wu Bo <wubo40@...wei.com>
Cc:     kbusch@...nel.org, axboe@...com, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linfeilong@...wei.com
Subject: Re: [PATCH] nvme-multipath: combine grpid and ANA state checks in
 nvme_parse_ana_log()

On Tue, Jun 08, 2021 at 12:13:36PM +0800, Wu Bo wrote:
> -		if (WARN_ON_ONCE(desc->grpid == 0))
> +		if (WARN_ON_ONCE(desc->grpid == 0 ||
> +			le32_to_cpu(desc->grpid) > ctrl->anagrpmax))
>  			return -EINVAL;
> -		if (WARN_ON_ONCE(le32_to_cpu(desc->grpid) > ctrl->anagrpmax))
> -			return -EINVAL;
> -		if (WARN_ON_ONCE(desc->state == 0))
> -			return -EINVAL;
> -		if (WARN_ON_ONCE(desc->state > NVME_ANA_CHANGE))
> +		if (WARN_ON_ONCE(desc->state == 0 ||
> +			desc->state > NVME_ANA_CHANGE))

So besides making the code impossibl to read due to the incorrect
indentation this also makes each WARN_ON_ONCE cover multiple conditions.
Not very useful for debugging.