Re: [PATCH 44/93] clocksource/drivers/time-armada-370-xp: Convert init function to return error

[Anna-Maria Gleixner]

On Thu, 7 Jul 2016, 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.lezc...@linaro.org>
> ---
>  drivers/clocksource/time-armada-370-xp.c | 102 
> +++++++++++++++++++++++--------
>  1 file changed, 76 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/clocksource/time-armada-370-xp.c 
> b/drivers/clocksource/time-armada-370-xp.c
> index 601dbf74..bc4ab48 100644
> --- a/drivers/clocksource/time-armada-370-xp.c
> +++ b/drivers/clocksource/time-armada-370-xp.c
> @@ -323,33 +336,54 @@ static void __init 
> armada_370_xp_timer_common_init(struct device_node *np)
>                               "armada_370_xp_per_cpu_tick",
>                               armada_370_xp_evt);
>       /* Immediately configure the timer on the boot CPU */
> -     if (!res)
> -             armada_370_xp_timer_setup(this_cpu_ptr(armada_370_xp_evt));
> +     if (res) {
> +             pr_err("Failed to request percpu irq");
> +             return res;
> +     }
> +
> +     res = armada_370_xp_timer_setup(this_cpu_ptr(armada_370_xp_evt));
> +     if (!res) {

I think the "!" is a mistake, because armada_370_xp_timer_setup()
returns zero. See delta patch fixing this below.

> +             pr_err("Failed to setup timer");
> +             return res;
> +     }


8<-------------------
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -342,7 +342,7 @@ static int __init armada_370_xp_timer_co
        }
 
        res = armada_370_xp_timer_setup(this_cpu_ptr(armada_370_xp_evt));
-       if (!res) {
+       if (res) {
                pr_err("Failed to setup timer");
                return res;
        }