netdev - Re: [PATCH 1/2] mdio_bus: implement devm_mdiobus_alloc/devm_mdiobus

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Date:	Tue, 8 Apr 2014 12:52:05 +0300
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	<netdev@...r.kernel.org>
CC:	<davinci-linux-open-source@...ux.davincidsp.com>,
	<linux-doc@...r.kernel.org>, Randy Dunlap <rdunlap@...radead.org>,
	<linux-kernel@...r.kernel.org>, <santosh.shilimkar@...com>,
	"David S. Miller" <davem@...emloft.net>,
	Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH 1/2] mdio_bus: implement devm_mdiobus_alloc/devm_mdiobus_free

On 04/04/2014 04:15 PM, Sergei Shtylyov wrote:
> Hello.
>
> On 04-04-2014 17:40, Grygorii Strashko wrote:
>
>> Add a resource managed devm_mdiobus_alloc()/devm_mdiobus_free()
>> to automatically clean up MDIO bus alocations made by MDIO drivers,
>> thus leading to simplified MDIO drivers code.
>
>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> [...]
>
>> diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
>> index 76f54b3..fdcd6d1 100644
>> --- a/drivers/net/phy/mdio_bus.c
>> +++ b/drivers/net/phy/mdio_bus.c
>> @@ -69,6 +69,74 @@ struct mii_bus *mdiobus_alloc_size(size_t size)
>>   }
>>   EXPORT_SYMBOL(mdiobus_alloc_size);
>>
>> +static void _devm_mdiobus_free(struct device *dev, void *res)
>> +{
>> +    mdiobus_free(*(struct mii_bus **)res);
>> +}
>> +
>> +static int devm_mdiobus_match(struct device *dev, void *res, void *data)
>> +{
>> +    struct mii_bus **r = res;
>
>     Please insert an empty line after declaration.
>
>> +    if (!r || !*r) {
>> +        WARN_ON(!r || !*r);
>
>     Hm, why we need the duplicate check This condition is always true.

It can be replaced with:
	if (WARN_ON(!r || !*r))
		return 0;


I will wait for additional comments, then resend.

Regards,
- grygorii

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