Hi Lee, Daniel, Jingoo,
On Wed, 22 Jan 2025 10:19:14 +0100
Herve Codina [off-list ref] wrote:
Lockdep detects the following issue on led-backlight removal:
[ 142.315935] ------------[ cut here ]------------
[ 142.315954] WARNING: CPU: 2 PID: 292 at drivers/leds/led-core.c:455 led_sysfs_enable+0x54/0x80
...
[ 142.500725] Call trace:
[ 142.503176] led_sysfs_enable+0x54/0x80 (P)
[ 142.507370] led_bl_remove+0x80/0xa8 [led_bl]
[ 142.511742] platform_remove+0x30/0x58
[ 142.515501] device_remove+0x54/0x90
...
Indeed, led_sysfs_enable() has to be called with the led_access
lock held.
Hold the lock when calling led_sysfs_disable().
Fixes: ae232e45acf9 ("backlight: add led-backlight driver")
Cc: <redacted>
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
I didn't receive any feedback.
v6.14-rc1 has been released since the patch was sent but the patch applies on
top of v6.14-rc1 without any issue.
Of course if really needed, I can resend the patch. Just tell me.
Best regards,
Hervé