[PATCH v3 01/12] gpio: rockchip: avoid division by zero

From: Ye Zhang
Date: Tue Sep 03 2024 - 10:14:15 EST


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

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

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index 0bd339813110..712258224eb3 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -207,6 +207,8 @@ 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)
return -EINVAL;
--
2.34.1