linux-kernel - Re: [PATCH V2 08/63] clocksource/drivers/st_lpc: Convert init function to return error

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Date:	Mon, 20 Jun 2016 09:39:31 +0200
From:	Patrice Chotard <patrice.chotard@...com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>, <tglx@...utronix.de>
CC:	<linux-kernel@...r.kernel.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...il.com>,
	Maxime Coquelin <maxime.coquelin@...com>,
	"moderated list:ARM/STI ARCHITECTURE" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:ARM/STI ARCHITECTURE" <kernel@...inux.com>
Subject: Re: [PATCH V2 08/63] clocksource/drivers/st_lpc: Convert init
 function to return error

Hi Daniel

On 06/16/2016 11:26 PM, 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/clksrc_st_lpc.c | 22 +++++++++++++---------
>   1 file changed, 13 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/clocksource/clksrc_st_lpc.c b/drivers/clocksource/clksrc_st_lpc.c
> index 65ec467..c9022a9 100644
> --- a/drivers/clocksource/clksrc_st_lpc.c
> +++ b/drivers/clocksource/clksrc_st_lpc.c
> @@ -92,7 +92,7 @@ static int __init st_clksrc_setup_clk(struct device_node *np)
>   	return 0;
>   }
>   
> -static void __init st_clksrc_of_register(struct device_node *np)
> +static int __init st_clksrc_of_register(struct device_node *np)
>   {
>   	int ret;
>   	uint32_t mode;
> @@ -100,32 +100,36 @@ static void __init st_clksrc_of_register(struct device_node *np)
>   	ret = of_property_read_u32(np, "st,lpc-mode", &mode);
>   	if (ret) {
>   		pr_err("clksrc-st-lpc: An LPC mode must be provided\n");
> -		return;
> +		return ret;
>   	}
>   
>   	/* LPC can either run as a Clocksource or in RTC or WDT mode */
>   	if (mode != ST_LPC_MODE_CLKSRC)
> -		return;
> +		return 0;
>   
>   	ddata.base = of_iomap(np, 0);
>   	if (!ddata.base) {
>   		pr_err("clksrc-st-lpc: Unable to map iomem\n");
> -		return;
> +		return -ENXIO;
>   	}
>   
> -	if (st_clksrc_setup_clk(np)) {
> +	ret = st_clksrc_setup_clk(np);
> +	if (ret) {
>   		iounmap(ddata.base);
> -		return;
> +		return ret;
>   	}
>   
> -	if (st_clksrc_init()) {
> +	ret = st_clksrc_init();
> +	if (ret) {
>   		clk_disable_unprepare(ddata.clk);
>   		clk_put(ddata.clk);
>   		iounmap(ddata.base);
> -		return;
> +		return ret;
>   	}
>   
>   	pr_info("clksrc-st-lpc: clocksource initialised - running @ %luHz\n",
>   		clk_get_rate(ddata.clk));
> +
> +	return ret;
>   }
> -CLOCKSOURCE_OF_DECLARE(ddata, "st,stih407-lpc", st_clksrc_of_register);
> +CLOCKSOURCE_OF_DECLARE_RET(ddata, "st,stih407-lpc", st_clksrc_of_register);

Acked-by: Patrice Chotard <patrice.chotard@...com>