[PATCH v4 0/6] gpio: Refactor and add selftest

[Tzung-Bi Shih <tzungbi@kernel.org>]

The series is separated from v3 to lessen the burden on the subsequent
revocable work per suggestion in
https://lore.kernel.org/all/CAMRc=MfQumD1ULx7yU4W2sx=35wyQf7-v4tSf44OqEu3JDBUAg@mail.gmail.com/.

The series is based on v7.0-rc1 and applies after
https://lore.kernel.org/all/20260205092840.2574840-1-tzungbi@kernel.org.

---
v4:
- Separate the first 6 patches from v3.

v3: https://lore.kernel.org/all/20260213092958.864411-1-tzungbi@kernel.org

Tzung-Bi Shih (6):
  gpio: Access `gpio_bus_type` in gpiochip_setup_dev()
  gpio: Remove redundant check for struct gpio_chip
  gpio: sysfs: Remove redundant check for struct gpio_chip
  gpio: Ensure struct gpio_chip for gpiochip_setup_dev()
  gpio: cdev: Don't check struct gpio_chip in gpio_chrdev_open()
  selftests: gpio: Add gpio-cdev-uaf tests

 drivers/gpio/gpiolib-cdev.c                   |  20 +-
 drivers/gpio/gpiolib-cdev.h                   |   2 +-
 drivers/gpio/gpiolib-sysfs.c                  |  32 +-
 drivers/gpio/gpiolib-sysfs.h                  |   8 +-
 drivers/gpio/gpiolib.c                        |  46 +--
 tools/testing/selftests/gpio/Makefile         |   5 +-
 tools/testing/selftests/gpio/gpio-cdev-uaf.c  | 292 ++++++++++++++++++
 tools/testing/selftests/gpio/gpio-cdev-uaf.sh |  63 ++++
 8 files changed, 402 insertions(+), 66 deletions(-)
 create mode 100644 tools/testing/selftests/gpio/gpio-cdev-uaf.c
 create mode 100755 tools/testing/selftests/gpio/gpio-cdev-uaf.sh

-- 
2.51.0