linux-kernel - Re: [PATCH] s5p-mfc: Don't try to put pm->clock if lookup failed

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Message-ID: <090a74db-f168-ed0a-f0f5-5ecd10ec80fc@osg.samsung.com>
Date:	Mon, 2 May 2016 15:12:48 -0400
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	Arnd Bergmann <arnd@...db.de>, linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Kamil Debski <k.debski@...sung.com>,
	Jeongtae Park <jtp.park@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-media@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH] s5p-mfc: Don't try to put pm->clock if lookup failed

Hello Arnd,

Thanks for your feedback.

On 05/02/2016 02:41 PM, Arnd Bergmann wrote:
> On Monday 02 May 2016 13:27:54 Javier Martinez Canillas wrote:
>> Failing to get the struct s5p_mfc_pm .clock is a non-fatal error so the
>> clock field can have a errno pointer value. But s5p_mfc_final_pm() only
>> checks if .clock is not NULL before attempting to unprepare and put it.
>>
>> This leads to the following warning in clk_put() due s5p_mfc_final_pm():
>>
> 
> Better assign the pointer to NULL in case of a non-fatal error
> return code. That way, the reader doesn't have to wonder why you
> have the IS_ERR_OR_NULL() check here.
>

Ok, I'll re-spin the patch doing that instead.
 
> 	Arnd
> 

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America