linux-kernel - Re: [PATCH RFT 3/3] ARM: tegra: dts: seaboard: enable keyboard

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Message-ID: <20130111232438.GN23505@n2100.arm.linux.org.uk>
Date:	Fri, 11 Jan 2013 23:24:39 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Laxman Dewangan <ldewangan@...dia.com>,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFT 3/3] ARM: tegra: dts: seaboard: enable keyboard

On Fri, Jan 11, 2013 at 04:09:59PM -0700, Stephen Warren wrote:
> On 01/11/2013 06:33 AM, Laxman Dewangan wrote:
> > 	kbc->clk = clk_get(&pdev->dev, NULL);
> > 	if (IS_ERR(kbc->clk)) {
> > 		dev_err(&pdev->dev, "failed to get keyboard clock\n");
> > 		err = PTR_ERR(kbc->clk);
> > 		goto err_iounmap;
> > 	}
> 
> Should that check be if (!kbc-clk) instead? Or does the common clock
> framework require if (IS_ERR_OR_NULL(kbc->clk)); hopefully not since
> IS_ERR_OR_NULL shouldn't be used any more.

/**
 * clk_get - lookup and obtain a reference to a clock producer.
 * @dev: device for clock "consumer"
 * @id: clock consumer ID
 *
 * Returns a struct clk corresponding to the clock producer, or
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 * valid IS_ERR() condition containing errno.  ...
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Or, put another way:

	If (!IS_ERR(clk))
		The_Clock_Is_Valid();
	Else
		The_Clock_Is_Invalid();
		The_Error = PTR_ERR(clk);
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