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=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 38F4EC433EA for ; Mon, 20 Jul 2020 16:10:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 175F02064B for ; Mon, 20 Jul 2020 16:10:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595261427; bh=Ei8M7Vswo4eUwg7xiB3VR63fvxyvSUHoXgg/uOrPlCo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hHiMJuV+B9A+5hpUPQD54PoT3xP0p6nghdHQnnh2QidzHq2l4FpP5y0lLs+R3fd0t 7tlUgu6LDFQwNDndI5D6SaXiBwUAvL9vyKahO8QtMJytcZeXOStjBArHs9lZA7ha+0 7lE6tiAZBcmM9VJUEtKdUNXi6nZVPAbDVpJdMCt8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387662AbgGTQKZ (ORCPT ); Mon, 20 Jul 2020 12:10:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:48826 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387656AbgGTQKU (ORCPT ); Mon, 20 Jul 2020 12:10:20 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 8522920684; Mon, 20 Jul 2020 16:10:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595261420; bh=Ei8M7Vswo4eUwg7xiB3VR63fvxyvSUHoXgg/uOrPlCo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ml1e/gtTqHSqp/zCdiauIyRCe8YGUm+pAoVJyn5g8/DS5Y1/C3bqdD5bk5hwRKaPr 9iRIEF2TxsKXAloyqELTPqFyNmIi5DKl23ctCmtbCfqE4sxJki6g66+/4loyoX3WMB OoMK1811bPg91Gk+Av5OFcxglsX1lAtLAOMoBT8M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Syed Nayyar Waris , Jonathan Cameron , Sasha Levin Subject: [PATCH 5.7 079/244] counter: 104-quad-8: Add lock guards - filter clock prescaler Date: Mon, 20 Jul 2020 17:35:50 +0200 Message-Id: <20200720152829.600731933@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200720152825.863040590@linuxfoundation.org> References: <20200720152825.863040590@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Syed Nayyar Waris [ Upstream commit d5ed76adb926a90fada98f518abc1ab6ef07d28f ] Add lock protection from race conditions to the 104-quad-8 counter driver for filter clock prescaler code changes. Mutex calls used for protection. Signed-off-by: Syed Nayyar Waris Fixes: de65d0556343 ("counter: 104-quad-8: Support Filter Clock Prescaler") Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- drivers/counter/104-quad-8.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c index 9364dc188f8ff..d22cfae1b0198 100644 --- a/drivers/counter/104-quad-8.c +++ b/drivers/counter/104-quad-8.c @@ -1365,6 +1365,8 @@ static ssize_t quad8_signal_fck_prescaler_write(struct counter_device *counter, if (ret) return ret; + mutex_lock(&priv->lock); + priv->fck_prescaler[channel_id] = prescaler; /* Reset Byte Pointer */ @@ -1375,6 +1377,8 @@ static ssize_t quad8_signal_fck_prescaler_write(struct counter_device *counter, outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC, base_offset + 1); + mutex_unlock(&priv->lock); + return len; } -- 2.25.1