linux-kernel - Re: [PATCH v2 12/47] mfd: ab8500-sysctrl: Register with kernel poweroff handler

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Date:	Mon, 27 Oct 2014 16:59:00 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 12/47] mfd: ab8500-sysctrl: Register with kernel
 poweroff handler

On Tue, Oct 21, 2014 at 6:12 AM, Guenter Roeck <linux@...ck-us.net> wrote:

> Register with kernel poweroff handler instead of setting pm_power_off
> directly. Register with low priority to reflect that the original code
> only sets pm_power_off if it was not already set.
>
> sysctrl_dev is set prior to poweroff handler registration, and the
> poweroff handler is unregistered prior to clearing sysrctrl_dev.
> It is therefore not necessary to check if sysctrl_dev is NULL in the
> poweroff handler, and the check was removed. Setting sysctrl_dev to NULL
> in the remove function was also removed as unnecessary. With those changes,
> devm_register_power_off_handler can be used to register the poeroff handler.
> The now empty remove function was retained since the ab8500_restart function,
> which is currently unused, would likely need some cleanup if it was ever used.
>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Lee Jones <lee.jones@...aro.org>
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
> v2:
> - Use define to specify poweroff handler priority
> - Use devm_register_power_off_handler
> - Use dev_warn instead of dev_err
> - Since we use devm_register_power_off_handler,
>   we need to check if sysctrl_dev in the poweroff handler to avoid
>   a race condition on unload, so this check is no longer removed

I can't compile this, I guess because of a dependency on some
other patch?

  CC      drivers/mfd/ab8500-sysctrl.o
../drivers/mfd/ab8500-sysctrl.c:94:14: error: ‘POWEROFF_PRIORITY_LOW’
undeclared here (not in a function)
  .priority = POWEROFF_PRIORITY_LOW,
              ^
../drivers/mfd/ab8500-sysctrl.c: In function ‘ab8500_sysctrl_probe’:
../drivers/mfd/ab8500-sysctrl.c:206:2: error: implicit declaration of
function ‘devm_register_power_off_handler’
[-Werror=implicit-function-declaration]
  err = devm_register_power_off_handler(sysctrl_dev, &ab8500_poweroff_nb);

I wanted to provide a Tested-by but I guess I can only give this:
Acked-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij
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