linux-kernel - [PATCH] media: venus: use div64_u64() instead of do

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Date: Fri, 29 Dec 2023 17:45:04 +0530
From: Himanshu Bhavani <himanshu.bhavani@...iconsignals.io>
To: stanimir.k.varbanov@...il.com,
	quic_vgarodia@...cinc.com,
	agross@...nel.org,
	andersson@...nel.org,
	konrad.dybcio@...aro.org,
	mchehab@...nel.org
Cc: himanshu.bhavani@...iconsignals.io,
	"Bryan O'Donoghue" <bryan.odonoghue@...aro.org>,
	linux-media@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] media: venus: use div64_u64() instead of do_div()

do_div() does a 64-by-32 division.
When the divisor is u64, do_div() truncates it to 32 bits, this means it
can test non-zero and be truncated to zero for division.

fix do_div.cocci warning:
do_div() does a 64-by-32 division, please consider using div64_u64 instead.

Signed-off-by: Himanshu Bhavani <himanshu.bhavani@...iconsignals.io>

diff --git a/drivers/media/platform/qcom/venus/venc.c b/drivers/media/platform/qcom/venus/venc.c
index 44b13696cf82..81853eb2993a 100644
--- a/drivers/media/platform/qcom/venus/venc.c
+++ b/drivers/media/platform/qcom/venus/venc.c
@@ -409,13 +409,13 @@ static int venc_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
 	out->capability = V4L2_CAP_TIMEPERFRAME;
 
 	us_per_frame = timeperframe->numerator * (u64)USEC_PER_SEC;
-	do_div(us_per_frame, timeperframe->denominator);
+	div64_u64(us_per_frame, timeperframe->denominator);
 
 	if (!us_per_frame)
 		return -EINVAL;
 
 	fps = (u64)USEC_PER_SEC;
-	do_div(fps, us_per_frame);
+	div64_u64(fps, us_per_frame);
 
 	inst->timeperframe = *timeperframe;
 	inst->fps = fps;
-- 
2.25.1