linux-kernel - Re: [PATCH V3] clocksource/drivers/bcm_kona: Convert init function to return error

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Message-ID: <0a8c9ef4-5d38-515e-2070-10c6758aebd7@broadcom.com>
Date:	Mon, 20 Jun 2016 10:50:29 -0700
From:	Ray Jui <ray.jui@...adcom.com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>, tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org, f.fainelli@...il.com,
	sbranden@...adcom.com, bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH V3] clocksource/drivers/bcm_kona: Convert init function to
 return error

Hi Daniel,

On 6/20/2016 10:48 AM, Daniel Lezcano wrote:
> The init functions do not return any error. They behave as the following:
>
>   - panic, thus leading to a kernel crash while another timer may work and
>        make the system boot up correctly
>
>   or
>
>   - print an error and let the caller unaware if the state of the system
>
> Change that by converting the init functions to return an error conforming
> to the CLOCKSOURCE_OF_RET prototype.
>
> Proper error handling (rollback, errno value) will be changed later case
> by case, thus this change just return back an error or success in the init
> function.
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  drivers/clocksource/bcm_kona_timer.c | 15 ++++++---------
>  1 file changed, 6 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/clocksource/bcm_kona_timer.c b/drivers/clocksource/bcm_kona_timer.c
> index e717e87..c251aa6 100644
> --- a/drivers/clocksource/bcm_kona_timer.c
> +++ b/drivers/clocksource/bcm_kona_timer.c
> @@ -163,16 +163,11 @@ static struct irqaction kona_timer_irq = {
>  	.handler = kona_timer_interrupt,
>  };
>
> -static void __init kona_timer_init(struct device_node *node)
> +static int __init kona_timer_init(struct device_node *node)
>  {
>  	u32 freq;
>  	struct clk *external_clk;
>
> -	if (!of_device_is_available(node)) {
> -		pr_info("Kona Timer v1 marked as disabled in device tree\n");
> -		return;
> -	}
> -
>  	external_clk = of_clk_get_by_name(node, NULL);
>
>  	if (!IS_ERR(external_clk)) {
> @@ -182,7 +177,7 @@ static void __init kona_timer_init(struct device_node *node)
>  		arch_timer_rate = freq;
>  	} else {
>  		pr_err("Kona Timer v1 unable to determine clock-frequency");
> -		return;
> +		return -EINVAL;
>  	}
>
>  	/* Setup IRQ numbers */
> @@ -196,11 +191,13 @@ static void __init kona_timer_init(struct device_node *node)
>  	kona_timer_clockevents_init();
>  	setup_irq(timers.tmr_irq, &kona_timer_irq);
>  	kona_timer_set_next_event((arch_timer_rate / HZ), NULL);
> +
> +	return 0;
>  }
>
> -CLOCKSOURCE_OF_DECLARE(brcm_kona, "brcm,kona-timer", kona_timer_init);
> +CLOCKSOURCE_OF_DECLARE_RET(brcm_kona, "brcm,kona-timer", kona_timer_init);
>  /*
>   * bcm,kona-timer is deprecated by brcm,kona-timer
>   * being kept here for driver compatibility
>   */
> -CLOCKSOURCE_OF_DECLARE(bcm_kona, "bcm,kona-timer", kona_timer_init);
> +CLOCKSOURCE_OF_DECLARE_RET(bcm_kona, "bcm,kona-timer", kona_timer_init);

Looks good to me!

Acked-by: Ray Jui <ray.jui@...adcom.com>

Thanks,

Ray