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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A68F0C6FA99 for ; Fri, 10 Mar 2023 14:16:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232084AbjCJOQH (ORCPT ); Fri, 10 Mar 2023 09:16:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46484 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231960AbjCJOPr (ORCPT ); Fri, 10 Mar 2023 09:15:47 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8DFEC149B4 for ; Fri, 10 Mar 2023 06:14:39 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 4C9C4B822B5 for ; Fri, 10 Mar 2023 14:14:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 89086C433EF; Fri, 10 Mar 2023 14:14:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678457677; bh=rVmzu436hL6wpCEbeJGCB8yDDzgA+Enkw6jZj/ZF+0o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J4948zf/60M/eNmWEVibOkG3VnLrSUcJoNT4vomHdoCeNexKc7fN3MWbUcu6h0WiG CvwYpwxpfPGOiOT/Dr6XqUbb9pvpQJauRohmHJQRz5NhhXPOZHrJadwpnRm25kVbBv BOZ8FTtPxcG0EJNE0C3EfEn77JpSIMY2rKOFNWK0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pietro Borrello , Benjamin Tissoires , Stefan Ghinea Subject: [PATCH 4.19 002/252] HID: asus: use spinlock to protect concurrent accesses Date: Fri, 10 Mar 2023 14:36:12 +0100 Message-Id: <20230310133718.885032142@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133718.803482157@linuxfoundation.org> References: <20230310133718.803482157@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Pietro Borrello commit 315c537068a13f0b5681d33dd045a912f4bece6f upstream. asus driver has a worker that may access data concurrently. Proct the accesses using a spinlock. Fixes: af22a610bc38 ("HID: asus: support backlight on USB keyboards") Signed-off-by: Pietro Borrello Link: https://lore.kernel.org/r/20230125-hid-unregister-leds-v4-4-7860c5763c38@diag.uniroma1.it Signed-off-by: Benjamin Tissoires Signed-off-by: Stefan Ghinea Signed-off-by: Greg Kroah-Hartman --- drivers/hid/hid-asus.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) --- a/drivers/hid/hid-asus.c +++ b/drivers/hid/hid-asus.c @@ -84,6 +84,7 @@ struct asus_kbd_leds { struct hid_device *hdev; struct work_struct work; unsigned int brightness; + spinlock_t lock; bool removed; }; @@ -318,7 +319,12 @@ static void asus_kbd_backlight_set(struc { struct asus_kbd_leds *led = container_of(led_cdev, struct asus_kbd_leds, cdev); + unsigned long flags; + + spin_lock_irqsave(&led->lock, flags); led->brightness = brightness; + spin_unlock_irqrestore(&led->lock, flags); + schedule_work(&led->work); } @@ -326,8 +332,14 @@ static enum led_brightness asus_kbd_back { struct asus_kbd_leds *led = container_of(led_cdev, struct asus_kbd_leds, cdev); + enum led_brightness brightness; + unsigned long flags; - return led->brightness; + spin_lock_irqsave(&led->lock, flags); + brightness = led->brightness; + spin_unlock_irqrestore(&led->lock, flags); + + return brightness; } static void asus_kbd_backlight_work(struct work_struct *work) @@ -335,11 +347,14 @@ static void asus_kbd_backlight_work(stru struct asus_kbd_leds *led = container_of(work, struct asus_kbd_leds, work); u8 buf[] = { FEATURE_KBD_REPORT_ID, 0xba, 0xc5, 0xc4, 0x00 }; int ret; + unsigned long flags; if (led->removed) return; + spin_lock_irqsave(&led->lock, flags); buf[4] = led->brightness; + spin_unlock_irqrestore(&led->lock, flags); ret = asus_kbd_set_report(led->hdev, buf, sizeof(buf)); if (ret < 0) @@ -380,6 +395,7 @@ static int asus_kbd_register_leds(struct drvdata->kbd_backlight->cdev.brightness_set = asus_kbd_backlight_set; drvdata->kbd_backlight->cdev.brightness_get = asus_kbd_backlight_get; INIT_WORK(&drvdata->kbd_backlight->work, asus_kbd_backlight_work); + spin_lock_init(&drvdata->kbd_backlight->lock); ret = devm_led_classdev_register(&hdev->dev, &drvdata->kbd_backlight->cdev); if (ret < 0) { @@ -689,9 +705,13 @@ err_stop_hw: static void asus_remove(struct hid_device *hdev) { struct asus_drvdata *drvdata = hid_get_drvdata(hdev); + unsigned long flags; if (drvdata->kbd_backlight) { + spin_lock_irqsave(&drvdata->kbd_backlight->lock, flags); drvdata->kbd_backlight->removed = true; + spin_unlock_irqrestore(&drvdata->kbd_backlight->lock, flags); + cancel_work_sync(&drvdata->kbd_backlight->work); }