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

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Message-ID: <2610031.B6nN8fjXyO@wuerfel>
Date:	Mon, 02 May 2016 20:41:11 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Javier Martinez Canillas <javier@....samsung.com>,
	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

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.

	Arnd