linux-kernel - RE: [PATCH 1/2] [media] V4L: atmel-isi: add code to enable/disableISI

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Date:	Wed, 7 Dec 2011 18:12:52 +0800
From:	"Wu, Josh" <Josh.wu@...el.com>
To:	"Russell King - ARM Linux" <linux@....linux.org.uk>
Cc:	<g.liakhovetski@....de>, <linux-media@...r.kernel.org>,
	"Ferre, Nicolas" <Nicolas.FERRE@...el.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 1/2] [media] V4L: atmel-isi: add code to enable/disableISI_MCK clock

Hi, Russell King

On Wed, Dec 07, 2011 at 4:50 PM, Russell King wrote:

> On Wed, Nov 30, 2011 at 06:06:43PM +0800, Josh Wu wrote:
>> +	/* Get ISI_MCK, provided by programmable clock or external clock
*/
>> +	isi->mck = clk_get(dev, "isi_mck");
>> +	if (IS_ERR_OR_NULL(isi->mck)) {

> This should be IS_ERR()

So it means the clk_get() will never return NULL even when clk structure
is NULL in clk lookup entry. Right?

>> +		dev_err(dev, "Failed to get isi_mck\n");
>> +		ret = isi->mck ? PTR_ERR(isi->mck) : -EINVAL;

>		ret = PTR_ERR(isi->mck);

Best Regards,
Josh Wu
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