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watchdog: msc313e: Avoid division by zero

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

Fixes: e9800b7994 ("watchdog: Add Mstar MSC313e WDT driver")
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://patch.msgid.link/20260828161348.13212-3-tzungbi@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Tzung-Bi Shih 2026-08-29 00:13:41 +08:00 committed by Guenter Roeck
parent 0fa37512eb
commit 3c73a37f5e
1 changed files with 5 additions and 1 deletions
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6
drivers/watchdog/msc313e_wdt.c
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@ -97,6 +97,7 @@ static int msc313e_wdt_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct msc313e_wdt_priv *priv;
unsigned long rate;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@ -116,7 +117,10 @@ static int msc313e_wdt_probe(struct platform_device *pdev)
priv->wdev.ops = &msc313e_wdt_ops,
priv->wdev.parent = dev;
priv->wdev.min_timeout = MSC313E_WDT_MIN_TIMEOUT;
priv->wdev.max_timeout = U32_MAX / clk_get_rate(priv->clk);
rate = clk_get_rate(priv->clk);
if (!rate)
return -EINVAL;
priv->wdev.max_timeout = U32_MAX / rate;
priv->wdev.timeout = MSC313E_WDT_DEFAULT_TIMEOUT;
/* If the period is non-zero the WDT is running */