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=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 D55A8C072B1 for ; Thu, 30 May 2019 04:38:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ADEA5258F4 for ; Thu, 30 May 2019 04:38:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559191116; bh=3J/n2st4d0hAJO8pcuzz+mcSFPyLHPTw3OKbxpL8evk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=mnsWXavUWsN2wPYq/sa9/AYhKYLjo1xhcf6XhuLmcSGkHqKpV+8/PjPIJLnkN1DH+ /cTaWMBTK4RmO3/0r47AIjJr/C4vFmmCH6lOcxdgNEDiK/nkUGO1bh/PJ10gFD3kc6 RweFdi5TO1sYwgIy/lYnVUxLtBfBGFwm7GKRzIQM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729653AbfE3Eia (ORCPT ); Thu, 30 May 2019 00:38:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:56136 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729192AbfE3DMo (ORCPT ); Wed, 29 May 2019 23:12:44 -0400 Received: from localhost (ip67-88-213-2.z213-88-67.customer.algx.net [67.88.213.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 026F023D14; Thu, 30 May 2019 03:12:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559185964; bh=3J/n2st4d0hAJO8pcuzz+mcSFPyLHPTw3OKbxpL8evk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qRgSIvFiSMvFp/+1SHR9nQlfU/riaPioyhNG6Gz54FiXpOPaPo26PpR4gD8nqymKJ 1IFzACQvr+i5J/fqgO5Hb/45Y/HCA/hMSrXX4KyXxCW0lM0LJqO7EEGH8RIoQicwZ5 7WD1uNJFjAsWKEyT1FCzsFeWerslrWwbAkJ21U1w= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Adam Thomson , Steve Twiss , Mark Brown , Sasha Levin Subject: [PATCH 5.1 381/405] regulator: pv88060: Fix notifier mutex lock warning Date: Wed, 29 May 2019 20:06:19 -0700 Message-Id: <20190530030600.002461339@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190530030540.291644921@linuxfoundation.org> References: <20190530030540.291644921@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit f58213637206e190453e3bd91f98f535566290a3 ] 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: f307a7e9b7af ("regulator: pv88060: new regulator driver") Suggested-by: Adam Thomson Signed-off-by: Steve Twiss Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/regulator/pv88060-regulator.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/regulator/pv88060-regulator.c b/drivers/regulator/pv88060-regulator.c index 1600f98218912..810816e9df5d5 100644 --- a/drivers/regulator/pv88060-regulator.c +++ b/drivers/regulator/pv88060-regulator.c @@ -244,9 +244,11 @@ static irqreturn_t pv88060_irq_handler(int irq, void *data) if (reg_val & PV88060_E_VDD_FLT) { for (i = 0; i < PV88060_MAX_REGULATORS; i++) { if (chip->rdev[i] != NULL) { + regulator_lock(chip->rdev[i]); regulator_notifier_call_chain(chip->rdev[i], REGULATOR_EVENT_UNDER_VOLTAGE, NULL); + regulator_unlock(chip->rdev[i]); } } @@ -261,9 +263,11 @@ static irqreturn_t pv88060_irq_handler(int irq, void *data) if (reg_val & PV88060_E_OVER_TEMP) { for (i = 0; i < PV88060_MAX_REGULATORS; i++) { if (chip->rdev[i] != NULL) { + regulator_lock(chip->rdev[i]); regulator_notifier_call_chain(chip->rdev[i], REGULATOR_EVENT_OVER_TEMP, NULL); + regulator_unlock(chip->rdev[i]); } } -- 2.20.1