From 35a6ba5aa97385f81ca38361a3e6bd6a2b4b1ceb Mon Sep 17 00:00:00 2001
From: Jianqun Xu <jay.xu@rock-chips.com>
Date: Thu, 16 Jun 2022 16:52:52 +0800
Subject: [PATCH] gpio/rockchip: avoid division by zero

If the clk_get_rate return '0', it will happen division by zero.

Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
Change-Id: I1d2c6b12b961a78629f22496fe8f8b685b27dc09
---
 drivers/gpio/gpio-rockchip.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index aceef0a21089..77c3f6f22ca9 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -199,8 +199,10 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc,
 	if (bank->gpio_type == GPIO_TYPE_V2 && !IS_ERR(bank->db_clk)) {
 		div_debounce_support = true;
 		freq = clk_get_rate(bank->db_clk);
+		if (!freq)
+			return -EINVAL;
 		max_debounce = (GENMASK(23, 0) + 1) * 2 * 1000000 / freq;
-		if (debounce > max_debounce)
+		if ((unsigned long)debounce > max_debounce)
 			return -EINVAL;
 
 		div = debounce * freq;