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

Catalin Marinas
2014-10-09T10:36:56Z

On Tue, Oct 07, 2014 at 09:00:48AM +0100, Lee Jones wrote:
> On Mon, 06 Oct 2014, Guenter Roeck wrote:
> > --- 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?

I guess it's because the sysctrl_dev is already initialised when
registering the power_off handler, so there isn't a way to call the
above function with a NULL sysctrl_dev. Probably even with the original
code you didn't need this check (after some race fix in
ab8500_sysctrl_remove but races is one of the things Guenter's patches
try to address).

--
Catalin