linux-kernel - [PATCH v5 5/6] media: venus: venc: Make the range of us_per

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Message-Id: <20250107-fix-cocci-v5-5-b26da641f730@chromium.org>
Date: Tue, 07 Jan 2025 10:54:30 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Stanimir Varbanov <stanimir.k.varbanov@...il.com>, 
 Vikash Garodia <quic_vgarodia@...cinc.com>, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>, 
 Hans Verkuil <hverkuil@...all.nl>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v5 5/6] media: venus: venc: Make the range of us_per_frame
 explicit

Fps bigger than 0.000232829 fps, this fits in a 32 bit us_per_frame.
There is no need to do a 64 bit division here.

Also, the driver only works with whole fps.

Found with cocci:
drivers/media/platform/qcom/venus/venc.c:418:1-7: WARNING: do_div() does a 64-by-32 division, please consider using div64_u64 instead.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/platform/qcom/venus/venc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/venc.c b/drivers/media/platform/qcom/venus/venc.c
index 17bec44c9825..2c1836712362 100644
--- a/drivers/media/platform/qcom/venus/venc.c
+++ b/drivers/media/platform/qcom/venus/venc.c
@@ -412,8 +412,7 @@ static int venc_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
 	do_div(us_per_frame, timeperframe->denominator);
 
 	us_per_frame = max(USEC_PER_SEC, us_per_frame);
-	fps = (u64)USEC_PER_SEC;
-	do_div(fps, us_per_frame);
+	fps = USEC_PER_SEC / (u32)us_per_frame;
 	fps = min(VENUS_MAX_FPS, fps);
 
 	inst->fps = fps;

-- 
2.47.1.613.gc27f4b7a9f-goog