[PATCH v1 4/5] gpio: rockchip: avoid division by zero
From: Ye Zhang <hidden>
Date: 2024-08-15 07:27:13
Also in:
linux-gpio, linux-rockchip, lkml
Subsystem:
arm/rockchip soc support, gpio subsystem, the rest · Maintainers:
Heiko Stuebner, Linus Walleij, Bartosz Golaszewski, Linus Torvalds
If the clk_get_rate return '0', it will happen division by zero. Signed-off-by: Ye Zhang <redacted> --- 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 8949324ed816..03e949b0a344 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c@@ -212,8 +212,10 @@ 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;
--
2.34.1