linux-kernel - Re: [PATCH 8/9] arch/powerpc/sysdev/ehv

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Message-ID: <4E53F9CE.1040106@freescale.com>
Date:	Tue, 23 Aug 2011 14:04:46 -0500
From:	Timur Tabi <timur@...escale.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Kumar Gala <galak@...nel.crashing.org>
CC:	Julia Lawall <julia@...u.dk>, <kernel-janitors@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 8/9] arch/powerpc/sysdev/ehv_pic.c: add missing kfree

Ben, Kumar, can one of you take a look at my question and help me out?

 wrote:
> On Mon, Aug 8, 2011 at 7:18 AM, Julia Lawall <julia@...u.dk> wrote:
> 
>> diff --git a/arch/powerpc/sysdev/ehv_pic.c b/arch/powerpc/sysdev/ehv_pic.c
>> index af1a5df..b6731e4 100644
>> --- a/arch/powerpc/sysdev/ehv_pic.c
>> +++ b/arch/powerpc/sysdev/ehv_pic.c
>> @@ -280,6 +280,7 @@ void __init ehv_pic_init(void)
>>
>>        if (!ehv_pic->irqhost) {
>>                of_node_put(np);
>> +               kfree(ehv_pic);
>>                return;
>>        }
> 
> Although the fix is correct, I think there is another bug in this
> function.  'np' is not released when the function finishes
> successfully.   I've looked at other functions that use
> irq_alloc_host(), and most of them do the same thing: they don't call
> of_node_put() on the device node pointer.  The only exception I've
> found is mpc5121_ads_cpld_pic_init().
> 
> Ben, Kumar: am I missing something?  irq_alloc_host() calls of_node_get():
> 
> 	host->of_node = of_node_get(of_node);
> 
> so doesn't that mean that the caller of irq_alloc_host() should
> release the device node pointer?
> 


-- 
Timur Tabi
Linux kernel developer at Freescale

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