hwmon: (gpio-fan) take fan_data->lock in gpio_fan_shutdown()

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set_fan_speed() writes the control GPIOs one bit at a time. Every
other caller locks around it; gpio_fan_shutdown() doesn't. If it races
a locked caller, the GPIO writes can interleave and leave the fan at a
speed neither caller asked for.

Fixes: b95579cd87 ("hwmon: (gpio-fan) Add a shutdown handler to poweroff the fans")
Reported-by: Sashiko AI review <sashiko-bot@kernel.org>
Link: https://lore.kernel.org/r/20260830152150.27F5F1F000E9@smtp.kernel.org
Assisted-by: Claude:claude-opus-4
Signed-off-by: Cong Nguyen <congnt264@gmail.com>
Link: https://patch.msgid.link/20260901155404.1532092-1-congnt264@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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Cong Nguyen 2026-09-01 22:54:04 +07:00 • committed by Guenter Roeck

parent 508baf1713

commit bb2424c350

1 changed files with 4 additions and 1 deletions

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drivers/hwmon/gpio-fan.c

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