From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@linaro.org>
Subject: Re: [PATCH v2 2/7] xen/arm: Implement hip04-d01 platform
Date: Tue, 04 Nov 2014 14:03:53 +0000
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To: Frediano Ziglio <frediano.ziglio@huawei.com>, Ian Campbell <ian.campbell@citrix.com>, Stefano Stabellini <stefano.stabellini@citrix.com>, Tim Deegan <tim@xen.org>
Cc: Zoltan Kiss <zoltan.kiss@huawei.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
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On 11/04/2014 01:52 PM, Frediano Ziglio wrote:
>>
>> [..]
>>
>>> +static void __init hip04_iounmap(void __iomem **p) {
>>> +    if ( *p )
>>> +    {
>>> +        iounmap(*p);
>>> +        *p = NULL;
>>> +    }
>>> +}
>>
>> What is used for? Should not iounmap enough?
>>
> 
> I just like to clear pointers after freeing them.

It's not really useful :).

If you really want to keep the *p = NULL. This could be simplify into:

hip04_iounmap(....)
{
   iounmap(*p);
   *p = NULL;
}

This is because iounmap takes care of NULL pointer.

Regards,

-- 
Julien Grall