linux-kernel - Re: [PATCH V3 1/2] devres: introduce API "devm

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Message-ID: <CAKDJKT7ZpH89k6a4yfbBt+dpQ3oM9Khe42VwFmEjKqmu55jNzw@mail.gmail.com>
Date:	Wed, 29 Jan 2014 16:38:20 +0530
From:	Manish Badarkhe <badarkhe.manish@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	gregkh@...uxfoundation.org, Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>
Subject: Re: [PATCH V3 1/2] devres: introduce API "devm_kstrdup"

Hi Joe,

Thank you for your review.

On Wed, Jan 29, 2014 at 9:48 AM, Joe Perches <joe@...ches.com> wrote:
> On Wed, 2014-01-29 at 09:33 +0530, Manish Badarkhe wrote:
>> This patch introduces "devm_kstrdup" API so that the
>> device's driver can allocate memory and copy string.
> []
>> diff --git a/drivers/base/devres.c b/drivers/base/devres.c
> []
>> @@ -791,6 +791,32 @@ void * devm_kmalloc(struct device *dev, size_t size, gfp_t gfp)
>>  EXPORT_SYMBOL_GPL(devm_kmalloc);
>>
>>  /**
>> + * devm_kstrdup - Allocate resource managed space and
>> + *                and copy an existing string
>> + * @dev: Device to allocate memory for
>> + * @s: the string to duplicate
>> + * @size: Allocation size
>
> Why is size necessary at all?
> I think it should be calculated by strlen

I thought of avoiding string length calculation in function.
But,yes its better to do it in function to avoid extra parsing
of argument to function.Will update code and
post a patch.

>> +char *devm_kstrdup(struct device *dev,
>> +                const char *s, size_t size, gfp_t gfp)
>> +{
>> +     char *buf;
>> +
>> +     if (!s)
>> +             return NULL;
>> +
>> +     buf = devm_kzalloc(dev, size, gfp);
>
> If this is really necessary, please use devm_kmalloc

devm_kzalloc is always better giving zeroed memory locations.
Is there any reason not to go for it?

Regards
Manish Badarkhe
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