linux-kernel - Re: [PATCH v2 23/26] media: venus: vdec: Make explicit the range of us_per

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Date: Sat, 20 Apr 2024 23:47:01 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Ricardo Ribalda <ribalda@...omium.org>,
 Martin Tuma <martin.tuma@...iteqautomotive.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Hugues Fruchet <hugues.fruchet@...s.st.com>,
 Alain Volmat <alain.volmat@...s.st.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Chen-Yu Tsai
 <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Samuel Holland <samuel@...lland.org>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>,
 Thierry Reding <thierry.reding@...il.com>,
 Jonathan Hunter <jonathanh@...dia.com>,
 Sowjanya Komatineni <skomatineni@...dia.com>,
 Luca Ceresoli <luca.ceresoli@...tlin.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Hans Verkuil <hverkuil@...all.nl>, Sergey Kozlov <serjk@...up.ru>,
 Abylay Ospan <aospan@...up.ru>,
 Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
 Dmitry Osipenko <digetx@...il.com>,
 Benjamin Mugnier <benjamin.mugnier@...s.st.com>,
 Sylvain Petinot <sylvain.petinot@...s.st.com>,
 Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
 Vikash Garodia <quic_vgarodia@...cinc.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-staging@...ts.linux.dev,
 linux-sunxi@...ts.linux.dev, linux-tegra@...r.kernel.org,
 linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 23/26] media: venus: vdec: Make explicit the range of
 us_per_frame

On 19/04/2024 10:48, 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.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>   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;
>   	inst->timeperframe = *timeperframe;
>   
>   	return 0;
> 

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>