linux-kernel - Re: [PATCH v2 04/12] ARM: davinci: WARN_ON() if clk

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Date:   Mon, 4 Feb 2019 20:18:38 -0600
From:   David Lechner <david@...hnology.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>, Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 04/12] ARM: davinci: WARN_ON() if clk_get() fails

On 2/4/19 11:17 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> Currently the timer code checks if the clock pointer passed to it is
> good (!IS_ERR(clk)). The new clocksource driver expects the clock to
> be functional and doesn't perform any checks so emit a warning if
> clk_get() fails. Apply this to all davinci platforms.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>   arch/arm/mach-davinci/da830.c  | 4 ++++
>   arch/arm/mach-davinci/da850.c  | 4 ++++
>   arch/arm/mach-davinci/dm355.c  | 4 ++++
>   arch/arm/mach-davinci/dm365.c  | 4 ++++
>   arch/arm/mach-davinci/dm644x.c | 4 ++++
>   arch/arm/mach-davinci/dm646x.c | 4 ++++
>   6 files changed, 24 insertions(+)
> 
> diff --git a/arch/arm/mach-davinci/da830.c b/arch/arm/mach-davinci/da830.c
> index 2cc9fe4c3a91..9a4b749cbb6b 100644
> --- a/arch/arm/mach-davinci/da830.c
> +++ b/arch/arm/mach-davinci/da830.c
> @@ -834,6 +834,10 @@ void __init da830_init_time(void)
>   	da830_pll_init(NULL, pll, NULL);
>   
>   	clk = clk_get(NULL, "timer0");
> +	if (WARN_ON(IS_ERR(clk))) {
> +		pr_err("Unable to get the timer clock\n");

Do we really need a warning _and_ an error?

> +		return;
> +	}
>   
>   	davinci_timer_init(clk);
>   }