From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E97ADC43381 for ; Mon, 11 Mar 2019 20:12:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B2877214AE for ; Mon, 11 Mar 2019 20:12:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552335161; bh=tA7N63A3Y2XUWDydx2+AxIUi/zFZdphvUHYoBS0xL9Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ocQY5amF58A9JXI+iubAKtD8XL2CMIZMRu1DGCVayS6cnQke8I4OdPxM+u7s3SQsX 01csFRb9Ux/qbWgXBi59pQLv0C+83HTYz9k6BeRwffAk8u+XibpukFOuyyCDmk/lQV nfGIkZE6RvY6PpIbYOR9sqiNdLasFLq6xVEYqszM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728808AbfCKUMk (ORCPT ); Mon, 11 Mar 2019 16:12:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:33326 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728419AbfCKT4G (ORCPT ); Mon, 11 Mar 2019 15:56:06 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9898C214D8; Mon, 11 Mar 2019 19:56:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552334165; bh=tA7N63A3Y2XUWDydx2+AxIUi/zFZdphvUHYoBS0xL9Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qJ12NynaUpkxDg88DyQtrCnlC6h7UpevPiN5wg/BqOGgQvglP7yJA5CEJvW8CMiG4 HqWVIWmeywJqUOdTn/vD62+JMTD65hz46HhIhWxm9y2M/Df4sUW7uwLpDRuRJmb/jg pFsm4QQS7wLYdxY8e21Qg4fdynpO1TRZ1TIAitvk= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Dmitry Torokhov , Sasha Levin , linux-input@vger.kernel.org Subject: [PATCH AUTOSEL 4.20 25/52] Input: cap11xx - switch to using set_brightness_blocking() Date: Mon, 11 Mar 2019 15:54:49 -0400 Message-Id: <20190311195516.137772-25-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190311195516.137772-1-sashal@kernel.org> References: <20190311195516.137772-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dmitry Torokhov [ Upstream commit 628442880af8c201d307a45f3862a7a17df8a189 ] Updating LED state requires access to regmap and therefore we may sleep, so we could not do that directly form set_brightness() method. Historically we used private work to adjust the brightness, but with the introduction of set_brightness_blocking() we no longer need it. As a bonus, not having our own work item means we do not have use-after-free issue as we neglected to cancel outstanding work on driver unbind. Reported-by: Sven Van Asbroeck Reviewed-by: Sven Van Asbroeck Acked-by: Jacek Anaszewski Signed-off-by: Dmitry Torokhov Signed-off-by: Sasha Levin --- drivers/input/keyboard/cap11xx.c | 35 ++++++++++---------------------- 1 file changed, 11 insertions(+), 24 deletions(-) diff --git a/drivers/input/keyboard/cap11xx.c b/drivers/input/keyboard/cap11xx.c index 312916f99597..73686c2460ce 100644 --- a/drivers/input/keyboard/cap11xx.c +++ b/drivers/input/keyboard/cap11xx.c @@ -75,9 +75,7 @@ struct cap11xx_led { struct cap11xx_priv *priv; struct led_classdev cdev; - struct work_struct work; u32 reg; - enum led_brightness new_brightness; }; #endif @@ -233,30 +231,21 @@ static void cap11xx_input_close(struct input_dev *idev) } #ifdef CONFIG_LEDS_CLASS -static void cap11xx_led_work(struct work_struct *work) +static int cap11xx_led_set(struct led_classdev *cdev, + enum led_brightness value) { - struct cap11xx_led *led = container_of(work, struct cap11xx_led, work); + struct cap11xx_led *led = container_of(cdev, struct cap11xx_led, cdev); struct cap11xx_priv *priv = led->priv; - int value = led->new_brightness; /* - * All LEDs share the same duty cycle as this is a HW limitation. - * Brightness levels per LED are either 0 (OFF) and 1 (ON). + * All LEDs share the same duty cycle as this is a HW + * limitation. Brightness levels per LED are either + * 0 (OFF) and 1 (ON). */ - regmap_update_bits(priv->regmap, CAP11XX_REG_LED_OUTPUT_CONTROL, - BIT(led->reg), value ? BIT(led->reg) : 0); -} - -static void cap11xx_led_set(struct led_classdev *cdev, - enum led_brightness value) -{ - struct cap11xx_led *led = container_of(cdev, struct cap11xx_led, cdev); - - if (led->new_brightness == value) - return; - - led->new_brightness = value; - schedule_work(&led->work); + return regmap_update_bits(priv->regmap, + CAP11XX_REG_LED_OUTPUT_CONTROL, + BIT(led->reg), + value ? BIT(led->reg) : 0); } static int cap11xx_init_leds(struct device *dev, @@ -299,7 +288,7 @@ static int cap11xx_init_leds(struct device *dev, led->cdev.default_trigger = of_get_property(child, "linux,default-trigger", NULL); led->cdev.flags = 0; - led->cdev.brightness_set = cap11xx_led_set; + led->cdev.brightness_set_blocking = cap11xx_led_set; led->cdev.max_brightness = 1; led->cdev.brightness = LED_OFF; @@ -312,8 +301,6 @@ static int cap11xx_init_leds(struct device *dev, led->reg = reg; led->priv = priv; - INIT_WORK(&led->work, cap11xx_led_work); - error = devm_led_classdev_register(dev, &led->cdev); if (error) { of_node_put(child); -- 2.19.1