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=-4.9 required=3.0 tests=DATE_IN_PAST_96_XX, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS 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 80001C43381 for ; Tue, 5 Mar 2019 18:09:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5A15820645 for ; Tue, 5 Mar 2019 18:09:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730866AbfCESIb (ORCPT ); Tue, 5 Mar 2019 13:08:31 -0500 Received: from mail1.bemta25.messagelabs.com ([195.245.230.1]:20553 "EHLO mail1.bemta25.messagelabs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726118AbfCESIa (ORCPT ); Tue, 5 Mar 2019 13:08:30 -0500 Received: from [46.226.52.98] (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256 bits)) by server-1.bemta.az-a.eu-west-1.aws.symcld.net id 5F/B0-19701-B1BBE7C5; Tue, 05 Mar 2019 18:08:27 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrIIsWRWlGSWpSXmKPExsVy8IPnUV3p3XU xBj1PmCymPnzCZvHtSgeTxeVdc9gcmD12zrrL7rFpVSebx+dNcgHMUayZeUn5FQmsGft6igue cFbM+b6AuYFxH0cXIxeHkMA6Ronv794xdzFyAjkVEvNvHGIBsXkFkiV2fP3PCGJzCjhKHOxdx wpR4yDRePsvG4jNJmAoMe/Ne7AaFgFViYWPNoLFhQU8JTYf7mIHsUUEPCRat28Am88sECtxft 5SqPmCEidnPmGBiEtIHHzxAqiGA2i+lsTyY5EgYQkBe4np76+ChSUE9CUaj8VChA0lvs/6xgJ hm0vcXv2AdQKj4CwkQ2chGbqAkWkVo3lSUWZ6RkluYmaOrqGBga6hoZGuoaWxrqm5XmKVbqJe aqlueWpxia6hXmJ5sV5xZW5yTopeXmrJJkZgcKcUHLTcwXhqefohRkkOJiVR3r6uuhghvqT8l MqMxOKM+KLSnNTiQ4wyHBxKErwOu4BygkWp6akVaZk5wDiDSUtw8CiJ8IrvBErzFhck5hZnpk OkTjHqcpxe+HAusxBLXn5eqpQ47ymQIgGQoozSPLgRsJi/xCgrJczLyMDAIMRTkFqUm1mCKv+ KUZyDUUmYlwVkCk9mXgncpldARzABHfH5cjXIESWJCCmpBkbJuxcrNP/GP5L5kuXFLndy5nxm fc0XK6OtF/iJ3eX4dHXKwpvMnBHis9dpCZ/ROCV2s01cPkxswambTk7NXz2nrD7swKOis+i++ tY5ITLHNZ7E/Ih9GPaQ50v7Ue5mwZdsb458DZvauFY173Z7e2f2ej+fMKWHmoc38mvzTdpwbl mDtO3vGjYlluKMREMt5qLiRABXxaEh9AIAAA== X-Env-Sender: stwiss.opensource@diasemi.com X-Msg-Ref: server-20.tower-262.messagelabs.com!1551809306!2441267!3 X-Originating-IP: [193.240.73.197] X-SYMC-ESS-Client-Auth: outbound-route-from=pass X-StarScan-Received: X-StarScan-Version: 9.31.5; banners=-,-,- X-VirusChecked: Checked Received: (qmail 30137 invoked from network); 5 Mar 2019 18:08:27 -0000 Received: from unknown (HELO sw-ex-cashub01.diasemi.com) (193.240.73.197) by server-20.tower-262.messagelabs.com with AES128-SHA256 encrypted SMTP; 5 Mar 2019 18:08:27 -0000 Received: from swsrvapps-01.diasemi.com (10.20.28.141) by SW-EX-CASHUB01.diasemi.com (10.20.16.140) with Microsoft SMTP Server id 14.3.408.0; Tue, 5 Mar 2019 18:08:25 +0000 Received: by swsrvapps-01.diasemi.com (Postfix, from userid 22547) id 2B7343FBE8; Tue, 5 Mar 2019 18:08:25 +0000 (GMT) Message-ID: <0181de94266385cfffe1c2cd0c199f1c49ca6b7b.1551808797.git.stwiss.opensource@diasemi.com> In-Reply-To: References: From: Steve Twiss Date: Tue, 26 Feb 2019 15:19:34 +0000 Subject: [PATCH 02/13] regulator: da9062: Fix notifier mutex lock warning To: Liam Girdwood , Mark Brown CC: Support Opensource , LKML MIME-Version: 1.0 Content-Type: text/plain X-KSE-AttachmentFiltering-Interceptor-Info: protection disabled X-KSE-ServerInfo: sw-ex-cashub01.diasemi.com, 9 X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: Clean, bases: 05/03/2019 17:23:00 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The mutex for the regulator_dev must be controlled by the caller of the regulator_notifier_call_chain(), as described in the comment for that function. Failure to mutex lock and unlock surrounding the notifier call results in a kernel WARN_ON_ONCE() which will dump a backtrace for the regulator_notifier_call_chain() when that function call is first made. The mutex can be controlled using the regulator_lock/unlock() API. Fixes: 4068e5182ada ("regulator: da9062: DA9062 regulator driver") Suggested-by: Adam Thomson Signed-off-by: Steve Twiss --- drivers/regulator/da9062-regulator.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/regulator/da9062-regulator.c b/drivers/regulator/da9062-regulator.c index 34a70d9..5224304 100644 --- a/drivers/regulator/da9062-regulator.c +++ b/drivers/regulator/da9062-regulator.c @@ -974,8 +974,10 @@ static irqreturn_t da9062_ldo_lim_event(int irq, void *data) continue; if (BIT(regl->info->oc_event.lsb) & bits) { + regulator_lock(regl->rdev); regulator_notifier_call_chain(regl->rdev, REGULATOR_EVENT_OVER_CURRENT, NULL); + regulator_unlock(regl->rdev); handled = IRQ_HANDLED; } } -- 1.9.3