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,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 DEFE3C072B1 for ; Thu, 30 May 2019 04:16:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A88DA25284 for ; Thu, 30 May 2019 04:16:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559189813; bh=veMxMigceTlUS8pLalrLar0Xh3MhnseaAOb7bVHQTNM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Y8NuWD/7/6IrXsJM4EdVz1Fa3tT1RCRNJ7o+POFnqvQ9FP6KTg5IMHiwJEcgSAqeV kDILoFg5+mwMaBMDrXIJc9azXe3dRj6xphcaWFO/TF6eI3dK5dz70QJI3/Ek+/jpuO 9LFygZFwS03+RjqZnPNjxeFRAMDhn7wRwEnNkRQQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730171AbfE3EQl (ORCPT ); Thu, 30 May 2019 00:16:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:39808 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729489AbfE3DPp (ORCPT ); Wed, 29 May 2019 23:15:45 -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 106E623D83; Thu, 30 May 2019 03:15:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559186145; bh=veMxMigceTlUS8pLalrLar0Xh3MhnseaAOb7bVHQTNM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0eUmdIKeQGId3uH1bT25yR9hqNIOS6UvjyM8wfZL4v0ju6jHxoNDAI7gkfSZc08xw QbGY/pKgK+YjHmZvH96oC2G5FDYXbbqBsUxYMfOxw9hTe8WlVzCJh7UY750tf1vbkj d3+8n2nb10WF0xUDumlI3Mv4MexFh2EdG7r4UG8A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Adam Thomson , Steve Twiss , Charles Keepax , Mark Brown , Sasha Levin Subject: [PATCH 5.0 323/346] regulator: wm831x isink: Fix notifier mutex lock warning Date: Wed, 29 May 2019 20:06:36 -0700 Message-Id: <20190530030557.147016739@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190530030540.363386121@linuxfoundation.org> References: <20190530030540.363386121@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 f7a621728a6a23bfd2c6ac4d3e42e1303aefde0f ] 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: d4d6b722e780 ("regulator: Add WM831x ISINK support") Suggested-by: Adam Thomson Signed-off-by: Steve Twiss Acked-by: Charles Keepax Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/regulator/wm831x-isink.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/regulator/wm831x-isink.c b/drivers/regulator/wm831x-isink.c index 6dd891d7eee3b..11f351191dba9 100644 --- a/drivers/regulator/wm831x-isink.c +++ b/drivers/regulator/wm831x-isink.c @@ -140,9 +140,11 @@ static irqreturn_t wm831x_isink_irq(int irq, void *data) { struct wm831x_isink *isink = data; + regulator_lock(isink->regulator); regulator_notifier_call_chain(isink->regulator, REGULATOR_EVENT_OVER_CURRENT, NULL); + regulator_unlock(isink->regulator); return IRQ_HANDLED; } -- 2.20.1