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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 C3A21C5DF60 for ; Fri, 8 Nov 2019 11:40:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8B6D121D7E for ; Fri, 8 Nov 2019 11:40:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573213224; bh=UNQs/91dK9j+/CpReb4++waTjXoKNuAIztVw5SJpU20=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Lu1dals8rifTKMtJ/ik2AZQumsktp/NhMVCQuV5bOkMAMWDQ2BiS5t6HiSVyr1Dkw lxVwbLX2aK/QcZ04v9myLwryMXLTffKd+qARXkSchxOu0r0FB1Z8O3hj636xiQPbKD iN3kg+SudMgc0qeFDzdJV2jQhYKgZq+QjdqmHRF8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388584AbfKHLkW (ORCPT ); Fri, 8 Nov 2019 06:40:22 -0500 Received: from mail.kernel.org ([198.145.29.99]:53144 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388499AbfKHLkK (ORCPT ); Fri, 8 Nov 2019 06:40:10 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A312720869; Fri, 8 Nov 2019 11:40:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573213210; bh=UNQs/91dK9j+/CpReb4++waTjXoKNuAIztVw5SJpU20=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oaG33f26paDniZ6uYNG11JaV/qEswcFo1nwo2/lCgurjUZnuNlUHY9qJ0pGrJ9vd5 fXkF/RFuyRd2hHA8nkcn3HijSrYwdFsJWOl3jaok49qicMRpm9wddoSRozMgXgBMIN 7YJqYakRiHdoy7znPCTySUumxxza7K2FGevU0qu0= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Colin Ian King , Mark Brown , Sasha Levin Subject: [PATCH AUTOSEL 4.19 091/205] ASoC: sgtl5000: avoid division by zero if lo_vag is zero Date: Fri, 8 Nov 2019 06:35:58 -0500 Message-Id: <20191108113752.12502-91-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191108113752.12502-1-sashal@kernel.org> References: <20191108113752.12502-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Colin Ian King [ Upstream commit 9ab708aef61f5620113269a9d1bdb1543d1207d0 ] In the case where lo_vag <= SGTL5000_LINE_OUT_GND_BASE, lo_vag is set to zero and later vol_quot is computed by dividing by lo_vag causing a division by zero error. Fix this by avoiding a zero division and set vol_quot to zero in this specific case so that the lowest setting for i is correctly set. Signed-off-by: Colin Ian King Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- sound/soc/codecs/sgtl5000.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c index 64a52d495b1f5..896412d11a31c 100644 --- a/sound/soc/codecs/sgtl5000.c +++ b/sound/soc/codecs/sgtl5000.c @@ -1387,7 +1387,7 @@ static int sgtl5000_set_power_regs(struct snd_soc_component *component) * Searching for a suitable index solving this formula: * idx = 40 * log10(vag_val / lo_cagcntrl) + 15 */ - vol_quot = (vag * 100) / lo_vag; + vol_quot = lo_vag ? (vag * 100) / lo_vag : 0; lo_vol = 0; for (i = 0; i < ARRAY_SIZE(vol_quot_table); i++) { if (vol_quot >= vol_quot_table[i]) -- 2.20.1