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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT 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 4ECE2C2BA19 for ; Wed, 22 Apr 2020 02:57:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3539720722 for ; Wed, 22 Apr 2020 02:57:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726485AbgDVC53 (ORCPT ); Tue, 21 Apr 2020 22:57:29 -0400 Received: from alexa-out-sd-01.qualcomm.com ([199.106.114.38]:9490 "EHLO alexa-out-sd-01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726359AbgDVC52 (ORCPT ); Tue, 21 Apr 2020 22:57:28 -0400 Received: from unknown (HELO ironmsg04-sd.qualcomm.com) ([10.53.140.144]) by alexa-out-sd-01.qualcomm.com with ESMTP; 21 Apr 2020 19:57:27 -0700 Received: from gurus-linux.qualcomm.com ([10.46.162.81]) by ironmsg04-sd.qualcomm.com with ESMTP; 21 Apr 2020 19:57:26 -0700 Received: by gurus-linux.qualcomm.com (Postfix, from userid 383780) id C40124C78; Tue, 21 Apr 2020 19:57:26 -0700 (PDT) From: Guru Das Srinagesh To: linux-pwm@vger.kernel.org Cc: Thierry Reding , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Subbaraman Narayanamurthy , David Collins , linux-kernel@vger.kernel.org, Guru Das Srinagesh , Alexander Shiyan , Arnd Bergmann Subject: [PATCH v13 04/11] pwm: clps711x: Cast period to u32 before use as divisor Date: Tue, 21 Apr 2020 19:57:16 -0700 Message-Id: <02ba64d8289bf84a8d140f5a3c38ed64a9474d3b.1587523702.git.gurus@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since the PWM framework is switching struct pwm_args.period's datatype to u64, prepare for this transition by typecasting it to u32. Also, since the dividend is still a 32-bit number, any divisor greater than the numerator will cause the quotient to be zero, so return 0 in that case to efficiently skip the division. Cc: Alexander Shiyan Cc: Arnd Bergmann Signed-off-by: Guru Das Srinagesh --- drivers/pwm/pwm-clps711x.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/pwm/pwm-clps711x.c b/drivers/pwm/pwm-clps711x.c index 924d39a..0d368ac 100644 --- a/drivers/pwm/pwm-clps711x.c +++ b/drivers/pwm/pwm-clps711x.c @@ -43,7 +43,10 @@ static void clps711x_pwm_update_val(struct clps711x_chip *priv, u32 n, u32 v) static unsigned int clps711x_get_duty(struct pwm_device *pwm, unsigned int v) { /* Duty cycle 0..15 max */ - return DIV_ROUND_CLOSEST(v * 0xf, pwm->args.period); + if ((u32)pwm->args.period > (v * 0xf)) + return 0; + + return DIV_ROUND_CLOSEST(v * 0xf, (u32)pwm->args.period); } static int clps711x_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project