From patchwork Thu Jul 6 10:04:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuijing Li X-Patchwork-Id: 1804240 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=mediatek.com header.i=@mediatek.com header.a=rsa-sha256 header.s=dk header.b=fJiHurZX; dkim-atps=neutral Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by legolas.ozlabs.org (Postfix) with ESMTP id 4QxXFd36znz20ZQ for ; Thu, 6 Jul 2023 20:04:53 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229556AbjGFKEu (ORCPT ); Thu, 6 Jul 2023 06:04:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53522 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229508AbjGFKEt (ORCPT ); Thu, 6 Jul 2023 06:04:49 -0400 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AC61DDD; Thu, 6 Jul 2023 03:04:43 -0700 (PDT) X-UUID: 844ca40e1be411ee9cb5633481061a41-20230706 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=TS+0nfycyMyZboLtN8mtKKdv0Ar+eMXmyw7XCZMA2LM=; b=fJiHurZXnnY+Lx6TfYtKU5N9yAVtg4kPU60MYMbHE+FqvFav2JzXuC7wRap1ytOAmVhpZigstnjRiFDC3Cer7+mgJ559SiDzZ0nVlIrMax4is+kLdeUeW2zgmjBxVRHIQM/mGQOTUeyGIAcD+XbpzQARdMJ44N1/w67IVy8cVJ0=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.27,REQID:dc2f369f-25e0-4dda-b1cc-f807240d32cb,IP:0,U RL:0,TC:0,Content:-25,EDM:0,RT:0,SF:95,FILE:0,BULK:0,RULE:Release_Ham,ACTI ON:release,TS:70 X-CID-INFO: VERSION:1.1.27,REQID:dc2f369f-25e0-4dda-b1cc-f807240d32cb,IP:0,URL :0,TC:0,Content:-25,EDM:0,RT:0,SF:95,FILE:0,BULK:0,RULE:Spam_GS981B3D,ACTI ON:quarantine,TS:70 X-CID-META: VersionHash:01c9525,CLOUDID:4396ee0d-c22b-45ab-8a43-3004e9216b56,B ulkID:230706180438HVKI64YI,BulkQuantity:0,Recheck:0,SF:19|48|38|29|28|17,T C:nil,Content:0,EDM:-3,IP:nil,URL:11|1,File:nil,Bulk:nil,QS:nil,BEC:nil,CO L:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_SDM,TF_CID_SPAM_ASC,TF_CID_SPAM_FAS, TF_CID_SPAM_FSD,TF_CID_SPAM_ULN X-UUID: 844ca40e1be411ee9cb5633481061a41-20230706 Received: from mtkmbs13n1.mediatek.inc [(172.21.101.193)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 986363233; Thu, 06 Jul 2023 18:04:38 +0800 Received: from mtkmbs13n1.mediatek.inc (172.21.101.193) by MTKMBS14N1.mediatek.inc (172.21.101.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Thu, 6 Jul 2023 18:04:36 +0800 Received: from mszsdhlt06.gcn.mediatek.inc (10.16.6.206) by mtkmbs13n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Thu, 6 Jul 2023 18:04:36 +0800 From: Shuijing Li To: , , , CC: , , , , , , , Shuijing Li Subject: [PATCH] pwm: mtk_disp: fix disp_pwm coverity issue Date: Thu, 6 Jul 2023 18:04:54 +0800 Message-ID: <20230706100454.28998-1-shuijing.li@mediatek.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 X-MTK: N X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_PASS, T_SCC_BODY_TEXT_LINE,T_SPF_TEMPERROR,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org There is a coverity issue in the original mtk_disp_pwm_get_state() function. In function call DIV64_U64_ROUND_UP, division by expression Which may be zero has undefined behavior. Fix this accordingly. Signed-off-by: Shuijing Li --- drivers/pwm/pwm-mtk-disp.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c index 79e321e96f56..ca00058a6ef4 100644 --- a/drivers/pwm/pwm-mtk-disp.c +++ b/drivers/pwm/pwm-mtk-disp.c @@ -196,6 +196,14 @@ static int mtk_disp_pwm_get_state(struct pwm_chip *chip, return err; } + rate = clk_get_rate(mdp->clk_main); + if (rate <= 0) { + dev_err(chip->dev, "Can't get rate: %pe\n", ERR_PTR(rate)); + clk_disable_unprepare(mdp->clk_mm); + clk_disable_unprepare(mdp->clk_main); + return err; + } + /* * Apply DISP_PWM_DEBUG settings to choose whether to enable or disable * registers double buffer and manual commit to working register before @@ -206,7 +214,6 @@ static int mtk_disp_pwm_get_state(struct pwm_chip *chip, mdp->data->bls_debug_mask, mdp->data->bls_debug_mask); - rate = clk_get_rate(mdp->clk_main); con0 = readl(mdp->base + mdp->data->con0); con1 = readl(mdp->base + mdp->data->con1); pwm_en = readl(mdp->base + DISP_PWM_EN);