linux-kernel - [PATCH v2 0/4] gpio: deprecate and track the removal of GPIO workarounds for regulators

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250401-gpio-todo-remove-nonexclusive-v2-0-7c1380797b0d@linaro.org>
Date: Tue, 01 Apr 2025 14:46:41 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Mark Brown <broonie@...nel.org>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v2 0/4] gpio: deprecate and track the removal of GPIO
 workarounds for regulators

The GPIOD_FLAGS_BIT_NONEXCLUSIVE flag and devm_gpiod_unhinge() helpers
were introduced as hacky workarounds for resource ownership issues in the
regulator subsystem. Unfortunately, people started using the former in
other places too and now it's in all kinds of drivers.

Let's deprecate both symbols officially, add them to the MAINTAINERS
keywords so that it pops up on our radars when used again, add a task to
track it and I plan to use the power sequencing subsystem to handle the
cases where non-exclusive access to GPIOs is required.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
Changes in v2:
- reword the task description to focus more on the solution than the
  problem description
- add a task for removing devm_gpiod_unhinge() as well
- Link to v1: https://lore.kernel.org/r/20250331-gpio-todo-remove-nonexclusive-v1-0-25f72675f304@linaro.org

---
Bartosz Golaszewski (4):
      gpio: deprecate the GPIOD_FLAGS_BIT_NONEXCLUSIVE flag
      gpio: deprecate devm_gpiod_unhinge()
      MAINTAINERS: add more keywords for the GPIO subsystem entry
      gpio: TODO: track the removal of regulator-related workarounds

 MAINTAINERS                   |  2 ++
 drivers/gpio/TODO             | 34 ++++++++++++++++++++++++++++++++++
 drivers/gpio/gpiolib-devres.c |  6 +++++-
 include/linux/gpio/consumer.h |  1 +
 4 files changed, 42 insertions(+), 1 deletion(-)
---
base-commit: 405e2241def89c88f008dcb899eb5b6d4be8b43c
change-id: 20250331-gpio-todo-remove-nonexclusive-ed875467eb56

Best regards,
-- 
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>