Re: [Xen-devel] [PATCH 12/44] mfd: ab8500-sysctrl: Register with kernel poweroff handler

[Lee Jones <lee.jones@xxxxxxxxxx>]

On Mon, 06 Oct 2014, Guenter Roeck wrote:

> Register with kernel poweroff handler instead of setting pm_power_off
> directly. Register with a low priority value of 64 to reflect that
> the original code only sets pm_power_off if it was not already set.
> 
> Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
> Cc: Lee Jones <lee.jones@xxxxxxxxxx>
> Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
>  drivers/mfd/ab8500-sysctrl.c | 26 +++++++++++++++-----------
>  1 file changed, 15 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/mfd/ab8500-sysctrl.c b/drivers/mfd/ab8500-sysctrl.c
> index 8e0dae5..677438f 100644
> --- a/drivers/mfd/ab8500-sysctrl.c
> +++ b/drivers/mfd/ab8500-sysctrl.c
> @@ -6,6 +6,7 @@

[...]

> +static int ab8500_power_off(struct notifier_block *this, unsigned long 
> unused1,
> +                         void *unused2)
>  {
>       sigset_t old;
>       sigset_t all;
> @@ -34,11 +36,6 @@ static void ab8500_power_off(void)
>       struct power_supply *psy;
>       int ret;
>  
> -     if (sysctrl_dev == NULL) {
> -             pr_err("%s: sysctrl not initialized\n", __func__);
> -             return;
> -     }

Can you explain the purpose of this change please?

>       /*
>        * If we have a charger connected and we're powering off,
>        * reboot into charge-only mode.
> @@ -83,8 +80,15 @@ shutdown:
>                                        AB8500_STW4500CTRL1_SWRESET4500N);
>               (void)sigprocmask(SIG_SETMASK, &old, NULL);
>       }
> +
> +     return NOTIFY_DONE;
>  }

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org â Open source software for ARM SoCs
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