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Jones" , Hans de Goede , =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= , Andy Shevchenko , Jian-Hong Pan Cc: platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org References: <20251129101307.18085-3-anton@khirnov.net> Content-Language: en-US, it-IT, en-US-large From: Denis Benato In-Reply-To: <20251129101307.18085-3-anton@khirnov.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/29/25 11:13, Anton Khirnov wrote: > 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: > > [...] > 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 > [...] Hi and thank you very much for this! Reviewed-by: Denis Benato > Fixes: 9fe44fc98ce4 ("platform/x86: asus-wmi: Simplify the keyboard brightness updating process") > Signed-off-by: Anton Khirnov > --- > v2: > - reworded commit message, adding traceback > - merged lines in kbd_led_set() signature > --- > 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 e72a2b5d158e..8e3300f5c294 100644 > --- a/drivers/platform/x86/asus-wmi.c > +++ b/drivers/platform/x86/asus-wmi.c > @@ -1619,14 +1619,14 @@ 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) > @@ -1802,7 +1802,7 @@ 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; >