From patchwork Wed Apr 22 06:51:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 11503091 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B2BF214B4 for ; Wed, 22 Apr 2020 06:51:40 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 91EAF206D9 for ; Wed, 22 Apr 2020 06:51:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ti.com header.i=@ti.com header.b="CSfSi1e2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 91EAF206D9 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=ti.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B24E26E5A1; Wed, 22 Apr 2020 06:51:34 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from fllv0016.ext.ti.com (fllv0016.ext.ti.com [198.47.19.142]) by gabe.freedesktop.org (Postfix) with ESMTPS id 503F76E312 for ; Wed, 22 Apr 2020 06:51:32 +0000 (UTC) Received: from fllv0035.itg.ti.com ([10.64.41.0]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id 03M6pTup049515; Wed, 22 Apr 2020 01:51:29 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1587538289; bh=LskT7Fluz1afemuppgQ3E8smEknLw7ty0G3qU//E2DU=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=CSfSi1e2omadz6STW3mIOTHuOExZA8JRd3dTbM2FLxp/79zIY5MGvasnIRMrio6c9 IMaJkb+nQAYGqgqjRaHkmXzYol/uPu8TfgtTu8IhavtSib0u5F48syiRUwpZU+o5Xx s8n8qgm4/scOLFiEOiOqOUTB0fvmcaFQc3fjccEA= Received: from DFLE102.ent.ti.com (dfle102.ent.ti.com [10.64.6.23]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTP id 03M6pT5V001135; Wed, 22 Apr 2020 01:51:29 -0500 Received: from DFLE114.ent.ti.com (10.64.6.35) by DFLE102.ent.ti.com (10.64.6.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3; Wed, 22 Apr 2020 01:51:28 -0500 Received: from fllv0040.itg.ti.com (10.64.41.20) by DFLE114.ent.ti.com (10.64.6.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3 via Frontend Transport; Wed, 22 Apr 2020 01:51:28 -0500 Received: from deskari.lan (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id 03M6pKUZ100224; Wed, 22 Apr 2020 01:51:26 -0500 From: Tomi Valkeinen To: Lee Jones , Daniel Thompson , Jingoo Han , Bartlomiej Zolnierkiewicz , , Subject: [PATCHv3 3/4] backlight: led_bl: add led_access locking Date: Wed, 22 Apr 2020 09:51:13 +0300 Message-ID: <20200422065114.22164-4-tomi.valkeinen@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200422065114.22164-1-tomi.valkeinen@ti.com> References: <20200422065114.22164-1-tomi.valkeinen@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tomi Valkeinen Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" led_bl does not lock 'led_access' when calling led_sysfs_disable and led_sysfs_enable, causing the below WARN. Add the locking. WARNING: CPU: 0 PID: 223 at drivers/leds/led-core.c:353 led_sysfs_disable+0x4c/0x5c Signed-off-by: Tomi Valkeinen Reviewed-by: Daniel Thompson --- drivers/video/backlight/led_bl.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c index c46ecdfe8b0a..63693c4f0883 100644 --- a/drivers/video/backlight/led_bl.c +++ b/drivers/video/backlight/led_bl.c @@ -216,8 +216,11 @@ static int led_bl_probe(struct platform_device *pdev) return PTR_ERR(priv->bl_dev); } - for (i = 0; i < priv->nb_leds; i++) + for (i = 0; i < priv->nb_leds; i++) { + mutex_lock(&priv->leds[i]->led_access); led_sysfs_disable(priv->leds[i]); + mutex_unlock(&priv->leds[i]->led_access); + } backlight_update_status(priv->bl_dev); @@ -233,8 +236,11 @@ static int led_bl_remove(struct platform_device *pdev) backlight_device_unregister(bl); led_bl_power_off(priv); - for (i = 0; i < priv->nb_leds; i++) + for (i = 0; i < priv->nb_leds; i++) { + mutex_lock(&priv->leds[i]->led_access); led_sysfs_enable(priv->leds[i]); + mutex_unlock(&priv->leds[i]->led_access); + } return 0; }