From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 169981DD529; Mon, 6 Jan 2025 12:21:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736166120; cv=none; b=gMhHWwjbY4gVOXAj8uPuGpWmAr5whB+AfOsRb2zZaaz4b0q7DVLMVbhVQ5L0mxuDQrPou3Wrjc8NGRjv5T31fWoyoi85tUoR7KGzo/ddvJkzK7tsAu9FSCCZxADytkHnn/0cW5mB549a56iCJpmso5RMzcFsWvet7Xoj4zpVSDc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736166120; c=relaxed/simple; bh=bbB1UHL57SGI86zjebsLsB4VAZH8OE8Jqp/y/zAiw3A=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=S20Gr7awYCLHhwPbn+edP1AzrETQIaLxDdm2vERuJt+M9F6oAReKP3l7OJ1TvlKufnc2WPJ6sy9t6g2eLKvmplP/eCaVYkfX2APM7Zt2ZPg0Dz1Cq7DP/5B7tuw0JXzn9GMyW633M5V5LR+SiZg4iMbi907auYXwGRPiSHLN3Ag= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id F1170C4CEE1; Mon, 6 Jan 2025 12:21:51 +0000 (UTC) Message-ID: Date: Mon, 6 Jan 2025 13:21:50 +0100 Precedence: bulk X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 23/26] media: venus: vdec: Make the range of us_per_frame explicit To: Ricardo Ribalda , Martin Tuma , Mauro Carvalho Chehab , Laurent Pinchart , Hugues Fruchet , Alain Volmat , Maxime Coquelin , Alexandre Torgue , Paul Kocialkowski , Greg Kroah-Hartman , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Sakari Ailus , Thierry Reding , Jonathan Hunter , Sowjanya Komatineni , Luca Ceresoli , Matthias Brugger , AngeloGioacchino Del Regno , Sergey Kozlov , Abylay Ospan , Ezequiel Garcia , Dmitry Osipenko , Benjamin Mugnier , Sylvain Petinot , Stanimir Varbanov , Vikash Garodia , Bryan O'Donoghue , Bjorn Andersson , Konrad Dybcio Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-staging@lists.linux.dev, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org References: <20240429-fix-cocci-v3-0-3c4865f5a4b0@chromium.org> <20240429-fix-cocci-v3-23-3c4865f5a4b0@chromium.org> Content-Language: en-US, nl From: Hans Verkuil Autocrypt: addr=hverkuil@xs4all.nl; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 29/04/2024 17:05, Ricardo Ribalda wrote: > Unless the fps is smaller than 0.000232829 fps, this fits in a 32 bit > number. Make that explicit. > > Found by cocci: > drivers/media/platform/qcom/venus/vdec.c:488:1-7: WARNING: do_div() does a 64-by-32 division, please consider using div64_u64 instead. > > Reviewed-by: Bryan O'Donoghue > Signed-off-by: Ricardo Ribalda > --- > drivers/media/platform/qcom/venus/vdec.c | 7 ++----- > 1 file changed, 2 insertions(+), 5 deletions(-) > > diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c > index 29130a9441e7..2b2874aedb2d 100644 > --- a/drivers/media/platform/qcom/venus/vdec.c > +++ b/drivers/media/platform/qcom/venus/vdec.c > @@ -464,7 +464,7 @@ static int vdec_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a) > struct venus_inst *inst = to_inst(file); > struct v4l2_captureparm *cap = &a->parm.capture; > struct v4l2_fract *timeperframe = &cap->timeperframe; > - u64 us_per_frame, fps; > + u64 us_per_frame; > > if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE && > a->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) > @@ -484,10 +484,7 @@ static int vdec_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a) > if (!us_per_frame) > return -EINVAL; > > - fps = (u64)USEC_PER_SEC; > - do_div(fps, us_per_frame); > - > - inst->fps = fps; > + inst->fps = USEC_PER_SEC / (u32)us_per_frame; What happens if us_per_frame > USEC_PER_SEC? inst->fps is now 0, and I wonder what issues that may cause. I will drop this patch from the PR, as it is probably wise to return an error if us_per_frame > USEC_PER_SEC. The same issue is present with the venc patch (24/26), but that wasn't included in the PR anyway. Regards, Hans > inst->timeperframe = *timeperframe; > > return 0; >