linux-kernel - Re: [PATCH] arm/tegra: clk

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Date:	Tue, 25 Oct 2011 09:26:08 -0700
From:	Joe Perches <joe@...ches.com>
To:	pdeschrijver@...dia.com
Cc:	Colin Cross <ccross@...roid.com>, Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dia.com>,
	Russell King <linux@....linux.org.uk>,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm/tegra: clk_get should not be fatal

On Tue, 2011-10-25 at 19:15 +0300, pdeschrijver@...dia.com wrote:
> The timer and rtc-timer clocks aren't gated by default, so there is no reason
> to crash the system if the dummy enable call failed.
[]
> diff --git a/arch/arm/mach-tegra/timer.c b/arch/arm/mach-tegra/timer.c
[]
> @@ -186,16 +186,20 @@ static void __init tegra_init_timer(void)
>  	int ret;
>  
>  	clk = clk_get_sys("timer", NULL);
> -	BUG_ON(IS_ERR(clk));
> -	clk_enable(clk);
> +	if (IS_ERR(clk))
> +		pr_warning("Unable to get timer clock");
> +	else
> +		clk_enable(clk);
>  
>  	/*
>  	 * rtc registers are used by read_persistent_clock, keep the rtc clock
>  	 * enabled
>  	 */
>  	clk = clk_get_sys("rtc-tegra", NULL);
> -	BUG_ON(IS_ERR(clk));
> -	clk_enable(clk);
> +	if (IS_ERR(clk))
> +		pr_warning("Unable to get rtc-tegra clock");
> +	else
> +		clk_enable(clk);

Are these messages are really necessary?
Maybe just:
	if (!IS_ERR(clk))
		clk_enable(clk)

If these are really necessary, please use
	pr_warn("Unable to get <foo>\n");
pr_warn and with a terminating newline.

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