[PATCH 00/12] notifier: add device-managed registration APIs and convert drivers

[Eliav Farber <farbere@amazon.com>]

Many drivers repeat the same boilerplate when registering notifiers with
device lifetime:

  1. Register the notifier with *_notifier_chain_register()
  2. Check for error
  3. Register a devm action to unregister on teardown
  4. Implement a per-driver static unregister callback

This series adds devm_atomic_notifier_chain_register(),
devm_blocking_notifier_chain_register(), and
devm_raw_notifier_chain_register() that automatically unregister the
notifier when the device is unbound, then converts 11 drivers to use
them.

Each conversion eliminates a per-driver unregister callback and the
associated devm_add_action_or_reset() call, reducing code by ~15 lines
per driver.

The implementation follows the established devres pattern used by other
device-managed kernel APIs.

Checkpatch reports 6 CHECKs (0 errors, 0 warnings) on patch 1:
- "extern prototypes should be avoided in .h files"
- "Alignment should match open parenthesis"

Both are intentional to match the existing coding style in notifier.h,
where all declarations use 'extern' and tab-indented continuation lines.

Eliav Farber (12):
  notifier: add device-managed registration APIs
  pwm: iqs620a: use devm_blocking_notifier_chain_register()
  iio: light: iqs621-als: use devm_blocking_notifier_chain_register()
  iio: position: iqs624: use devm_blocking_notifier_chain_register()
  gpio: adp5585: use devm_blocking_notifier_chain_register()
  platform/x86: bitland-mifs-wmi: use
    devm_blocking_notifier_chain_register()
  Input: adp5585: use devm_blocking_notifier_chain_register()
  ACPI: APEI: GHES: use devm_blocking_notifier_chain_register()
  platform/x86: uniwill-wmi: use devm_blocking_notifier_chain_register()
  gpio: eic-sprd: use devm_atomic_notifier_chain_register()
  gpio: gpiolib-kunit: use devm_blocking_notifier_chain_register()
  reboot: use devm_blocking_notifier_chain_register()

 drivers/acpi/apei/ghes.c                   |  15 +-
 drivers/gpio/gpio-adp5585.c                |  20 +--
 drivers/gpio/gpio-eic-sprd.c               |  17 +--
 drivers/gpio/gpiolib-kunit.c               |  14 +-
 drivers/iio/light/iqs621-als.c             |  24 +---
 drivers/iio/position/iqs624-pos.c          |  24 +---
 drivers/input/keyboard/adp5585-keys.c      |  18 +--
 drivers/platform/x86/bitland-mifs-wmi.c    |  17 +--
 drivers/platform/x86/uniwill/uniwill-wmi.c |  17 +--
 drivers/pwm/pwm-iqs620a.c                  |  21 +--
 include/linux/notifier.h                   |  10 ++
 kernel/notifier.c                          | 151 +++++++++++++++++++++
 kernel/reboot.c                            |  24 +---
 13 files changed, 191 insertions(+), 181 deletions(-)

-- 
2.47.3