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watchdog: airoha: Prevent division by zero when clock frequency is zero

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clk_get_rate() can return 0 when the clock provider is not properly
configured or the clock is unmanaged. The driver uses wdt_freq as a
divisor directly in airoha_wdt_probe() to compute max_timeout and in
airoha_wdt_get_timeleft() to compute the remaining time, which results
in a division by zero.

Add a check for wdt_freq == 0 in probe and return -EINVAL with
dev_err_probe() to prevent the division by zero and provide a
diagnostic message.

Fixes: 3cf67f3769 ("watchdog: Add support for Airoha EN7851 watchdog")
Signed-off-by: Wayen Yan <win847@gmail.com>
Link: https://lore.kernel.org/r/178347932594.81327.4834644880399144119@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Wayen Yan 2026-07-08 10:41:54 +08:00 committed by Guenter Roeck
parent 7362ba0f9c
commit bcfcd7619f
1 changed files with 3 additions and 0 deletions
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3
drivers/watchdog/airoha_wdt.c
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@ -147,6 +147,9 @@ static int airoha_wdt_probe(struct platform_device *pdev)
/* Watchdog ticks at half the bus rate */
airoha_wdt->wdt_freq = clk_get_rate(bus_clk) / 2;
if (!airoha_wdt->wdt_freq)
return dev_err_probe(dev, -EINVAL,
"invalid clock frequency\n");
/* Initialize struct watchdog device */
wdog_dev = &airoha_wdt->wdog_dev;