[PATCH v2] gpio: rockchip: resolve underflow issue
From: Ye Zhang <hidden>
Date: 2024-08-23 13:12:20
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
div_reg may be < 0 if debounce is zero, causing the unsigned int to
overflow.
Fixes: 3bcbd1a85b68 ("gpio/rockchip: support next version gpio controller")
Signed-off-by: Ye Zhang <redacted>
---
drivers/gpio/gpio-rockchip.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index bf22b103b6a2..c3a87d075908 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c@@ -204,8 +204,8 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc, unsigned int cur_div_reg; u64 div; - if (bank->gpio_type == GPIO_TYPE_V2 && !IS_ERR(bank->db_clk)) { - div_debounce_support = true; + div_debounce_support = (bank->gpio_type == GPIO_TYPE_V2) && !IS_ERR(bank->db_clk); + if (debounce && div_debounce_support) { freq = clk_get_rate(bank->db_clk); if (!freq) return -EINVAL;
@@ -216,8 +216,6 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc, div = (u64)debounce * freq; div_reg = DIV_ROUND_CLOSEST_ULL(div, 2 * USEC_PER_SEC) - 1; - } else { - div_debounce_support = false; } raw_spin_lock_irqsave(&bank->slock, flags);
--
2.34.1