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

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Message-ID: <3a243d2c-f9b9-edcf-1762-9b08cf21f152@huawei.com>
Date:   Tue, 8 Jun 2021 20:30:14 +0800
From:   Wu Bo <wubo40@...wei.com>
To:     Christoph Hellwig <hch@....de>
CC:     <kbusch@...nel.org>, <axboe@...com>, <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 2021/6/8 13:23, Christoph Hellwig wrote:
> 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.
> Indeed, not very useful for debugging, please ignore this patch.

Thanks,
Wu Bo
>