linux-kernel - [PATCH v2] gpio: rockchip: resolve overflow issues

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Message-Id: <20240823034314.62305-4-ye.zhang@rock-chips.com>
Date: Fri, 23 Aug 2024 11:43:06 +0800
From: Ye Zhang <ye.zhang@...k-chips.com>
To: linus.walleij@...aro.org,
	brgl@...ev.pl,
	heiko@...ech.de,
	linux-gpio@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	mika.westerberg@...ux.intel.com,
	andriy.shevchenko@...ux.intel.com,
	tao.huang@...k-chips.com,
	finley.xiao@...k-chips.com,
	tim.chen@...k-chips.com,
	elaine.zhang@...k-chips.com,
	Ye Zhang <ye.zhang@...k-chips.com>
Subject: [PATCH v2] gpio: rockchip: resolve overflow issues

Prevent overflow issues when performing debounce-related calculations.

Fixes: 3bcbd1a85b68 ("gpio/rockchip: support next version gpio controller")
Signed-off-by: Ye Zhang <ye.zhang@...k-chips.com>
---
 drivers/gpio/gpio-rockchip.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index 5f60162baaeb..bf22b103b6a2 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -209,11 +209,12 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc,
 		freq = clk_get_rate(bank->db_clk);
 		if (!freq)
 			return -EINVAL;
-		max_debounce = (GENMASK(23, 0) + 1) * 2 * 1000000 / freq;
+		div = (u64)(GENMASK(23, 0) + 1) * 2 * 1000000;
+		max_debounce = DIV_ROUND_CLOSEST_ULL(div, freq);
 		if (debounce > max_debounce)
 			return -EINVAL;
 
-		div = debounce * freq;
+		div = (u64)debounce * freq;
 		div_reg = DIV_ROUND_CLOSEST_ULL(div, 2 * USEC_PER_SEC) - 1;
 	} else {
 		div_debounce_support = false;
-- 
2.34.1