watchdog: atlas7_wdt: test clock rate to avoid division by 0
The clk API may return 0 on clk_get_rate, so we should check the result before using it as a divisor. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
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@ -154,6 +154,11 @@ static int atlas7_wdt_probe(struct platform_device *pdev)
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writel(0, wdt->base + ATLAS7_WDT_CNT_CTRL);
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wdt->tick_rate = clk_get_rate(clk);
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if (!wdt->tick_rate) {
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ret = -EINVAL;
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goto err1;
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}
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wdt->clk = clk;
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atlas7_wdd.min_timeout = 1;
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atlas7_wdd.max_timeout = UINT_MAX / wdt->tick_rate;
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