netdev - Re: [PATCH net-next v2 11/17] ethernet: ucc_geth: don't statically allocate eight ucc_geth

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Date:   Wed, 20 Jan 2021 12:25:02 +0100
From:   Rasmus Villemoes <rasmus.villemoes@...vas.dk>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        netdev@...r.kernel.org
Cc:     Li Yang <leoyang.li@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Zhao Qiang <qiang.zhao@....com>, Andrew Lunn <andrew@...n.ch>,
        Jakub Kicinski <kuba@...nel.org>,
        Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
Subject: Re: [PATCH net-next v2 11/17] ethernet: ucc_geth: don't statically
 allocate eight ucc_geth_info

On 20/01/2021 08.02, Christophe Leroy wrote:
>
>> @@ -3715,25 +3713,23 @@ static int ucc_geth_probe(struct
>> platform_device* ofdev)
>>       if ((ucc_num < 0) || (ucc_num > 7))
>>           return -ENODEV;
>>   -    ug_info = &ugeth_info[ucc_num];
>> -    if (ug_info == NULL) {
>> -        if (netif_msg_probe(&debug))
>> -            pr_err("[%d] Missing additional data!\n", ucc_num);
>> -        return -ENODEV;
>> -    }
>> +    ug_info = kmalloc(sizeof(*ug_info), GFP_KERNEL);
> 
> What about using devm_kmalloc() and avoid those kfree and associated goto ?

I already replied to that: I'd rather not mix kmalloc() and
devm_kmalloc() as that makes it much harder to reason about the order in
which stuff gets deallocated. But sure, if you insist.

Rasmus