From patchwork Thu Aug 22 19:39:30 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11109991 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B38F0112C for ; Thu, 22 Aug 2019 19:39:44 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9240B2341A for ; Thu, 22 Aug 2019 19:39:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="dQ1HC9qr" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9240B2341A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=yCoJgLmBnKiQizeJ5c2+ntL/V1OSPVeTJsPXC00vfqc=; b=dQ1HC9qrXjiVo5 JznrWAJKgcK0ism5g7P0Tpo6CH3HKUF83YUjC3qSb3bsPVXQOSAbkOyipT7y3JmAHbYqO/FdoDUai fE5QbpLKYEdjJ6mofEuZ53lV+tLj5G3CsqwUPa8RvapVltZd39s3WXDMKBnSbyRjZexvCUeW8PJ6C pcxF1OqvYjzspkvUwB4Jqmz40wpoZHasK6c7q61Qkmo1oEx3u0/XZd+kn2L8Q3JvEPlUxdh6s3xTo OQRSf1vHwcN8gZSMLFaxM//e0/C31i16NZnt9/ejnQleqSR0dzctHRuCMCqIlBuH8tq7YUAEICAgE NycC2gvEq+2KKLCj6d2g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i0svw-0002n2-0n; Thu, 22 Aug 2019 19:39:44 +0000 Received: from [177.133.63.56] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1i0svr-0002lT-KY; Thu, 22 Aug 2019 19:39:39 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92) (envelope-from ) id 1i0svo-0007IN-Em; Thu, 22 Aug 2019 16:39:36 -0300 From: Mauro Carvalho Chehab To: Linux Media Mailing List Subject: [PATCH 3/7] media: aspeed-video: address a protential usage of an unit var Date: Thu, 22 Aug 2019 16:39:30 -0300 Message-Id: <7c85f7dc159927a7316dc13f52697f157fb6e2bd.1566502743.git.mchehab+samsung@kernel.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <4a411ba155eb062b6575aba0824123c840806c0b.1566502743.git.mchehab+samsung@kernel.org> References: <4a411ba155eb062b6575aba0824123c840806c0b.1566502743.git.mchehab+samsung@kernel.org> MIME-Version: 1.0 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-aspeed@lists.ozlabs.org, Andrew Jeffery , openbmc@lists.ozlabs.org, Eddie James , Mauro Carvalho Chehab , Joel Stanley , Mauro Carvalho Chehab , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org While this might not occur in practice, if the device is doing the right thing, it would be teoretically be possible to have both hsync_counter and vsync_counter negatives. If this ever happen, ctrl will be undefined, but the driver will still call: aspeed_video_update(video, VE_CTRL, 0, ctrl); Change the code to prevent this to happen. This was warned by cppcheck: [drivers/media/platform/aspeed-video.c:653]: (error) Uninitialized variable: ctrl Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Eddie James --- drivers/media/platform/aspeed-video.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c index f899ac3b4a61..4ef37cfc8446 100644 --- a/drivers/media/platform/aspeed-video.c +++ b/drivers/media/platform/aspeed-video.c @@ -630,7 +630,7 @@ static void aspeed_video_check_and_set_polarity(struct aspeed_video *video) } if (hsync_counter < 0 || vsync_counter < 0) { - u32 ctrl; + u32 ctrl = 0; if (hsync_counter < 0) { ctrl = VE_CTRL_HSYNC_POL; @@ -650,7 +650,8 @@ static void aspeed_video_check_and_set_polarity(struct aspeed_video *video) V4L2_DV_VSYNC_POS_POL; } - aspeed_video_update(video, VE_CTRL, 0, ctrl); + if (ctrl) + aspeed_video_update(video, VE_CTRL, 0, ctrl); } }