From patchwork Wed Mar 2 22:33:35 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 8486511 X-Patchwork-Delegate: horms@verge.net.au Return-Path: X-Original-To: patchwork-linux-renesas-soc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 627CB9F2F0 for ; Wed, 2 Mar 2016 22:35:21 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D3CB620251 for ; Wed, 2 Mar 2016 22:35:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3FB932024C for ; Wed, 2 Mar 2016 22:35:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754373AbcCBWe5 (ORCPT ); Wed, 2 Mar 2016 17:34:57 -0500 Received: from sauhun.de ([89.238.76.85]:37222 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755829AbcCBWdu (ORCPT ); Wed, 2 Mar 2016 17:33:50 -0500 Received: from p5082e975.dip0.t-ipconnect.de ([80.130.233.117]:38122 helo=localhost) by pokefinder.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1abFL1-0007fo-Om; Wed, 02 Mar 2016 23:33:48 +0100 From: Wolfram Sang To: linux-kernel@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Thierry Reding , Joachim Eastwood , linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 4/6] pwm: pwm-lpc18xx-sct: test clock rate to avoid division by 0 Date: Wed, 2 Mar 2016 23:33:35 +0100 Message-Id: <1456958018-7849-5-git-send-email-wsa@the-dreams.de> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1456958018-7849-1-git-send-email-wsa@the-dreams.de> References: <1456958018-7849-1-git-send-email-wsa@the-dreams.de> Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Wolfram Sang The clk API may return 0 on clk_get_rate, so we should check the result before using it as a divisor. Signed-off-by: Wolfram Sang --- Should go individually via subsystem tree. drivers/pwm/pwm-lpc18xx-sct.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pwm/pwm-lpc18xx-sct.c b/drivers/pwm/pwm-lpc18xx-sct.c index 9163085101bc94..6487962c355c03 100644 --- a/drivers/pwm/pwm-lpc18xx-sct.c +++ b/drivers/pwm/pwm-lpc18xx-sct.c @@ -360,6 +360,8 @@ static int lpc18xx_pwm_probe(struct platform_device *pdev) } lpc18xx_pwm->clk_rate = clk_get_rate(lpc18xx_pwm->pwm_clk); + if (!lpc18xx_pwm->clk_rate) + return -EINVAL; mutex_init(&lpc18xx_pwm->res_lock); mutex_init(&lpc18xx_pwm->period_lock);