linux-kernel - Re: [PATCH 14/20] ethernet: ucc_geth: don't statically allocate eight ucc_geth

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Date:   Tue, 8 Dec 2020 22:17:06 +0100
From:   Rasmus Villemoes <rasmus.villemoes@...vas.dk>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Li Yang <leoyang.li@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Vladimir Oltean <vladimir.oltean@....com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, Zhao Qiang <qiang.zhao@....com>
Subject: Re: [PATCH 14/20] ethernet: ucc_geth: don't statically allocate eight
 ucc_geth_info

On 08/12/2020 16.13, Christophe Leroy wrote:
> 
> 
> Le 05/12/2020 à 20:17, Rasmus Villemoes a écrit :

>> @@ -3714,25 +3712,23 @@ 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);
> 
> Could we use dev_kmalloc() instead, to avoid the freeing on the wait out
> and the err_free_info: path ?

Perhaps, but I don't think mixing ordinary kmalloc() with devm_ versions
in the same driver is a good idea - IIRC there are at least some rules
to obey if one does that, but I don't remember and can't find what they are.

Rasmus