On Tue, Oct 21, 2014 at 6:12 AM, Guenter Roeck [off-list ref] 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 <redacted>
Cc: Lee Jones <redacted>
Cc: Samuel Ortiz <redacted>
Signed-off-by: Guenter Roeck <linux@roeck-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 <redacted>

Yours,
Linus Walleij