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watchdog: rtd119x: Avoid division by zero

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clk_get_rate() could return 0.  Avoid a division by zero panic.

Fixes: 2bdf6acbfe ("watchdog: Add Realtek RTD1295")
Cc: stable@vger.kernel.org
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://patch.msgid.link/20260913064851.8239-3-tzungbi@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Tzung-Bi Shih 2026-09-13 14:48:50 +08:00 committed by Guenter Roeck
parent 400cb663ca
commit 5af7d2cbd2
1 changed files with 6 additions and 1 deletions
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7
drivers/watchdog/rtd119x_wdt.c
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@ -98,6 +98,7 @@ static int rtd119x_wdt_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rtd119x_watchdog_device *data;
unsigned long rate;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
@ -111,10 +112,14 @@ static int rtd119x_wdt_probe(struct platform_device *pdev)
if (IS_ERR(data->clk))
return PTR_ERR(data->clk);
rate = clk_get_rate(data->clk);
if (!rate)
return -EINVAL;
data->wdt_dev.info = &rtd119x_wdt_info;
data->wdt_dev.ops = &rtd119x_wdt_ops;
data->wdt_dev.timeout = 120;
data->wdt_dev.max_timeout = 0xffffffff / clk_get_rate(data->clk);
data->wdt_dev.max_timeout = 0xffffffff / rate;
data->wdt_dev.min_timeout = 1;
data->wdt_dev.parent = dev;