linux-kernel - Re: [PATCH V2 04/63] clocksource/drivers/mkt_timer: Convert init function to return error

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Message-ID: <57642242.2050607@gmail.com>
Date:	Fri, 17 Jun 2016 18:16:02 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>, tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org,
	"moderated list:ARM/Mediatek SoC..." 
	<linux-arm-kernel@...ts.infradead.org>,
	"moderated list:ARM/Mediatek SoC..." 
	<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH V2 04/63] clocksource/drivers/mkt_timer: Convert init
 function to return error



On 16/06/16 23:26, 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/mtk_timer.c | 10 ++++++----
>   1 file changed, 6 insertions(+), 4 deletions(-)
>

Acked-by: Matthias Brugger <matthias.bgg@...il.com>

> diff --git a/drivers/clocksource/mtk_timer.c b/drivers/clocksource/mtk_timer.c
> index 7e583f8..432a2c0 100644
> --- a/drivers/clocksource/mtk_timer.c
> +++ b/drivers/clocksource/mtk_timer.c
> @@ -181,7 +181,7 @@ static void mtk_timer_enable_irq(struct mtk_clock_event_device *evt, u8 timer)
>   			evt->gpt_base + GPT_IRQ_EN_REG);
>   }
>
> -static void __init mtk_timer_init(struct device_node *node)
> +static int __init mtk_timer_init(struct device_node *node)
>   {
>   	struct mtk_clock_event_device *evt;
>   	struct resource res;
> @@ -190,7 +190,7 @@ static void __init mtk_timer_init(struct device_node *node)
>
>   	evt = kzalloc(sizeof(*evt), GFP_KERNEL);
>   	if (!evt)
> -		return;
> +		return -ENOMEM;
>
>   	evt->dev.name = "mtk_tick";
>   	evt->dev.rating = 300;
> @@ -248,7 +248,7 @@ static void __init mtk_timer_init(struct device_node *node)
>
>   	mtk_timer_enable_irq(evt, GPT_CLK_EVT);
>
> -	return;
> +	return 0;
>
>   err_clk_disable:
>   	clk_disable_unprepare(clk);
> @@ -262,5 +262,7 @@ err_mem:
>   	release_mem_region(res.start, resource_size(&res));
>   err_kzalloc:
>   	kfree(evt);
> +
> +	return -EINVAL;
>   }
> -CLOCKSOURCE_OF_DECLARE(mtk_mt6577, "mediatek,mt6577-timer", mtk_timer_init);
> +CLOCKSOURCE_OF_DECLARE_RET(mtk_mt6577, "mediatek,mt6577-timer", mtk_timer_init);
>