linux-kernel - Re: [PATCH 3/5] mt76: fix a leaked reference by adding a missingof_node

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Date:   Mon, 8 Apr 2019 09:37:24 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Wen Yang <wen.yang99@....com.cn>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     UNGLinuxDriver@...rochip.com,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Anirudha Sarangi <anirudh@...inx.com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Michal Simek <michal.simek@...inx.com>,
        Felix Fietkau <nbd@....name>,
        Vivien Didelot <vivien.didelot@...il.com>,
        John Linn <John.Linn@...inx.com>,
        Yi Wang <wang.yi59@....com.cn>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] mt76: fix a leaked reference by adding a
 missingof_node_put

>>> @@ -54,22 +54,30 @@  mt76_get_of_eeprom(struct mt76_dev *dev, int len)
>>>          part = np->name;
>>>
>>>      mtd = get_mtd_device_nm(part);
>> …
>>> +    if (retlen < len) {
>>> +        ret = -EINVAL;
>>> +        goto out_put_node;
>>
>> I find a jump to an immediately following source code place unnecessary.
>> Would you like to delete it?
>>
>>
>>> +    }
>>>
>>> -    return 0;
>>> +out_put_node:
>>> +    of_node_put(np);
>>> +    return ret;
>>>  #else
>>
>> Can another bit of fine-tuning matter here?
>> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/net/wireless/mediatek/mt76/eeprom.c?id=34e022d8b780a03902d82fb3997ba7c7b1f40c81#n73
…
> We may have some different opinions here.

Obviously, yes for this implementation detail.


> Deleting the goto statement may not be good.

I find such an adjustment helpful here.


> If the code further up is changed it's easy enough to miss
> that a goto statement needs to be added here.

There are the usual consequences to consider for every change.


> Better to set ret to zero explicitly, this is the success path after all.

I disagree to this information because the variable was set to
the return value from a call of the function “mtd_read” already.

Regards,
Markus