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

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Date:	Thu, 09 Oct 2014 06:26:46 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Lee Jones <lee.jones@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>
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Subject: Re: [PATCH 12/44] mfd: ab8500-sysctrl: Register with kernel poweroff
 handler

On 10/09/2014 03:49 AM, Lee Jones wrote:
> On Thu, 09 Oct 2014, Catalin Marinas wrote:
>
>> 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).
>
> Sounds reasonable, although I think this change should be part of
> another patch.
>
Sure, no problem. I'll split this into two patches.

Since we are at it, any idea what to do with the restart function
in the same file ? It is not used anywhere.

Guenter

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