6.6-stable review patch. If anyone has any objections, please let me know.
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From: Anton Khirnov anton@khirnov.net
[ Upstream commit ccb61a328321ba3f8567e350664c9ca7a42b6c70 ]
kbd_led_set() can sleep, and so may not be used as the brightness_set() callback.
Otherwise using this led with a trigger leads to system hangs accompanied by: BUG: scheduling while atomic: acpi_fakekeyd/2588/0x00000003 CPU: 4 UID: 0 PID: 2588 Comm: acpi_fakekeyd Not tainted 6.17.9+deb14-amd64 #1 PREEMPT(lazy) Debian 6.17.9-1 Hardware name: ASUSTeK COMPUTER INC. ASUS EXPERTBOOK B9403CVAR/B9403CVAR, BIOS B9403CVAR.311 12/24/2024 Call Trace: <TASK> [...] schedule_timeout+0xbd/0x100 __down_common+0x175/0x290 down_timeout+0x67/0x70 acpi_os_wait_semaphore+0x57/0x90 [...] asus_wmi_evaluate_method3+0x87/0x190 [asus_wmi] led_trigger_event+0x3f/0x60 [...]
Fixes: 9fe44fc98ce4 ("platform/x86: asus-wmi: Simplify the keyboard brightness updating process") Signed-off-by: Anton Khirnov anton@khirnov.net Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Reviewed-by: Denis Benato benato.denis96@gmail.com Link: https://patch.msgid.link/20251129101307.18085-3-anton@khirnov.net Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/platform/x86/asus-wmi.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c index 2c894ea8aa817..b56be64fcc631 100644 --- a/drivers/platform/x86/asus-wmi.c +++ b/drivers/platform/x86/asus-wmi.c @@ -1405,14 +1405,14 @@ static void do_kbd_led_set(struct led_classdev *led_cdev, int value) kbd_led_update(asus); }
-static void kbd_led_set(struct led_classdev *led_cdev, - enum led_brightness value) +static int kbd_led_set(struct led_classdev *led_cdev, enum led_brightness value) { /* Prevent disabling keyboard backlight on module unregister */ if (led_cdev->flags & LED_UNREGISTERING) - return; + return 0;
do_kbd_led_set(led_cdev, value); + return 0; }
static void kbd_led_set_by_kbd(struct asus_wmi *asus, enum led_brightness value) @@ -1565,7 +1565,7 @@ static int asus_wmi_led_init(struct asus_wmi *asus) asus->kbd_led_wk = led_val; asus->kbd_led.name = "asus::kbd_backlight"; asus->kbd_led.flags = LED_BRIGHT_HW_CHANGED; - asus->kbd_led.brightness_set = kbd_led_set; + asus->kbd_led.brightness_set_blocking = kbd_led_set; asus->kbd_led.brightness_get = kbd_led_get; asus->kbd_led.max_brightness = 3;