linux-kernel - [PATCH 2/5] iio: proximity: hx9023s: Protect against division by zero in set_samp

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Message-Id: <20260209-upstream-20260219-v1-2-2b4d74e309d1@gmail.com>
Date: Mon, 09 Feb 2026 11:37:03 +0800
From: Yasin Lee <yasin.lee.x@...il.com>
To: Jonathan Cameron <jic23@...nel.org>, 
 David Lechner <dlechner@...libre.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, yasin.lee.x@...look.com
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, Yasin Lee <yasin.lee.x@...il.com>
Subject: [PATCH 2/5] iio: proximity: hx9023s: Protect against division by
 zero in set_samp_freq

Avoid division by zero when sampling frequency is unspecified by
falling back to a default 100ms sampling period.

Signed-off-by: Yasin Lee <yasin.lee.x@...il.com>
---
 drivers/iio/proximity/hx9023s.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/proximity/hx9023s.c b/drivers/iio/proximity/hx9023s.c
index ad839db6b326..eb4902d18d74 100644
--- a/drivers/iio/proximity/hx9023s.c
+++ b/drivers/iio/proximity/hx9023s.c
@@ -719,7 +719,11 @@ static int hx9023s_set_samp_freq(struct hx9023s_data *data, int val, int val2)
 	struct device *dev = regmap_get_device(data->regmap);
 	unsigned int i, period_ms;
 
-	period_ms = div_u64(NANO, (val * MEGA + val2));
+	if (!val && !val2)
+		/* Fallback to a safe default sampling period */
+		period_ms = 100;
+	else
+		period_ms = div_u64(NANO, (val * MEGA + val2));
 
 	for (i = 0; i < ARRAY_SIZE(hx9023s_samp_freq_table); i++) {
 		if (period_ms == hx9023s_samp_freq_table[i])

-- 
2.43.0