From: Ye Zhang <ye.zhang@rock-chips.com>
To: Ye Zhang <ye.zhang@rock-chips.com>,
linus.walleij@linaro.org, brgl@bgdev.pl, heiko@sntech.de,
linux-gpio@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org,
mika.westerberg@linux.intel.com,
andriy.shevchenko@linux.intel.com, tao.huang@rock-chips.com,
finley.xiao@rock-chips.com, tim.chen@rock-chips.com,
elaine.zhang@rock-chips.com
Subject: [PATCH v3 01/12] gpio: rockchip: avoid division by zero
Date: Tue, 3 Sep 2024 15:36:38 +0800 [thread overview]
Message-ID: <20240903073649.237362-2-ye.zhang@rock-chips.com> (raw)
In-Reply-To: <20240903073649.237362-1-ye.zhang@rock-chips.com>
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@rock-chips.com>
---
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
next prev parent reply other threads:[~2024-09-03 14:12 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-03 7:36 [PATCH v3 00/12] gpio: rockchip: Update the GPIO driver Ye Zhang
2024-09-03 7:36 ` Ye Zhang [this message]
2024-09-03 15:53 ` [PATCH v3 01/12] gpio: rockchip: avoid division by zero Andy Shevchenko
2024-09-03 7:36 ` [PATCH v3 02/12] gpio: rockchip: release reference to device node Ye Zhang
2024-09-03 7:36 ` [PATCH v3 03/12] gpio: rockchip: resolve overflow issues Ye Zhang
2024-09-03 7:36 ` [PATCH v3 04/12] gpio: rockchip: resolve underflow issue Ye Zhang
2024-09-03 15:55 ` Andy Shevchenko
2024-09-03 7:36 ` [PATCH v3 05/12] gpio: rockchip: fix debounce calculate Ye Zhang
2024-09-03 7:36 ` [PATCH v3 08/12] gpio: rockchip: explan the format of the GPIO version ID Ye Zhang
2024-09-03 16:03 ` Andy Shevchenko
2024-09-03 7:36 ` [PATCH v3 09/12] gpio: rockchip: change the GPIO version judgment logic Ye Zhang
2024-09-03 16:05 ` Andy Shevchenko
2024-09-03 7:36 ` [PATCH v3 12/12] gpio: rockchip: replace mutex_lock() with guard() Ye Zhang
2024-09-03 16:10 ` Andy Shevchenko
2024-09-03 16:52 ` Christophe JAILLET
[not found] ` <20240903073649.237362-8-ye.zhang@rock-chips.com>
2024-09-03 15:59 ` [PATCH v3 07/12] gpio: rockchip: support 'clock-names' from dt nodes Andy Shevchenko
2024-09-03 16:00 ` [PATCH v3 00/12] gpio: rockchip: Update the GPIO driver Andy Shevchenko
[not found] ` <20240903073649.237362-11-ye.zhang@rock-chips.com>
2024-09-03 16:07 ` [PATCH v3 10/12] gpio: rockchip: support new version gpio Andy Shevchenko
[not found] ` <20240903073649.237362-12-ye.zhang@rock-chips.com>
2024-09-03 16:08 ` [PATCH v3 11/12] gpio: rockchip: Set input direction when request irq Andy Shevchenko
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