Re: [PATCH V2 25/63] clocksource/drivers/mxs_timer: Convert init function to return error

From: Uwe Kleine-König
Date: Fri Jun 17 2016 - 02:34:03 EST


Hello,

On Thu, Jun 16, 2016 at 11:26:44PM +0200, 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@xxxxxxxxxx>
> ---
> drivers/clocksource/mps2-timer.c | 10 ++++++----
> drivers/clocksource/mxs_timer.c | 2 +-

Did you forget to split here? The changelog only mentions mxs.

> 2 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/clocksource/mps2-timer.c b/drivers/clocksource/mps2-timer.c
> index 3d33a5e..c303fa9 100644
> --- a/drivers/clocksource/mps2-timer.c
> +++ b/drivers/clocksource/mps2-timer.c
> @@ -250,7 +250,7 @@ out:
> return ret;
> }
>
> -static void __init mps2_timer_init(struct device_node *np)
> +static int __init mps2_timer_init(struct device_node *np)
> {
> static int has_clocksource, has_clockevent;
> int ret;
> @@ -259,7 +259,7 @@ static void __init mps2_timer_init(struct device_node *np)
> ret = mps2_clocksource_init(np);
> if (!ret) {
> has_clocksource = 1;
> - return;
> + return 0;
> }
> }
>
> @@ -267,9 +267,11 @@ static void __init mps2_timer_init(struct device_node *np)
> ret = mps2_clockevent_init(np);
> if (!ret) {
> has_clockevent = 1;
> - return;
> + return 0;
> }
> }
> +
> + return 0;
> }
>
> -CLOCKSOURCE_OF_DECLARE(mps2_timer, "arm,mps2-timer", mps2_timer_init);
> +CLOCKSOURCE_OF_DECLARE_RET(mps2_timer, "arm,mps2-timer", mps2_timer_init);
> diff --git a/drivers/clocksource/mxs_timer.c b/drivers/clocksource/mxs_timer.c
> index f5ce296..16cf53b 100644
> --- a/drivers/clocksource/mxs_timer.c
> +++ b/drivers/clocksource/mxs_timer.c
> @@ -226,7 +226,7 @@ static int __init mxs_clocksource_init(struct clk *timer_clk)
> return 0;
> }
>
> -static void __init mxs_timer_init(struct device_node *np)
> +static int __init mxs_timer_init(struct device_node *np)
> {
> struct clk *timer_clk;
> int irq;

I didn't try, but I expect that the "return;" a few lines below results
in at least a warning and the compiler also warns about a missing return
at the end of the function.

Best regards
Uwe


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