From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E873835A92E; Fri, 9 Jan 2026 12:01:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767960062; cv=none; b=fhXYJE5pyunRq0zuCU0XBLQGTVYZwzJgIcmAaZkm5noYx4EyiC6CpRd0v2GIIXcmlCQTueas55TST8nr21gmHNn+E96A0VvWaeTpfeUBY0YG2nue9pnms+ONEEuyDLCq6pIukREMFCJWYRXEbF+vRoWR0l8J+1J6/8ho0OSFY9k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767960062; c=relaxed/simple; bh=c2xtxgH6noESJqXYTo+rZIcTI9JwWQNPuEwPstNEqGc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=uJK0HCqz1wqMlteNpYiS9GuBzrdv/mFWwhhU6lBUMEtX3kIHvHc9rJhBfuVf5ze2W2F21Rqq3LMHXOAYNIjazy2z1Z7hSsNa94sk0LKM8TIuKm61l/2bsKvS9uM/u5ZncAIUXH3EEfgYXkT3nBgRwh3JW5G+VzHgim1wlqDodXA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=INeW/mJg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="INeW/mJg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 213E1C16AAE; Fri, 9 Jan 2026 12:01:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767960061; bh=c2xtxgH6noESJqXYTo+rZIcTI9JwWQNPuEwPstNEqGc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=INeW/mJg2VUl/8/zHHvhOwvZB1taMcWcWk1J2e6PxFAyiNQcMl2t1vg+tnnrVjJdj D7lvUN1KNPzsixkDRYkqK3uyfWwqmYWffSWheKs5x6uC2q2BU3L0hc12BoZ04cDgl6 G4KWisPETF0teIcCYJQg5LHuwVIvqPXWgKvXJkig= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Anton Khirnov , Andy Shevchenko , Denis Benato , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Sasha Levin Subject: [PATCH 6.6 271/737] platform/x86: asus-wmi: use brightness_set_blocking() for kbd led Date: Fri, 9 Jan 2026 12:36:50 +0100 Message-ID: <20260109112144.193856586@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260109112133.973195406@linuxfoundation.org> References: <20260109112133.973195406@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Anton Khirnov [ 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: [...] 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 Reviewed-by: Andy Shevchenko Reviewed-by: Denis Benato Link: https://patch.msgid.link/20251129101307.18085-3-anton@khirnov.net Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen Signed-off-by: Sasha Levin --- 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; -- 2.51.0