rtc: verify a critical argument to rtc_update_irq() before using it
This small addition to the core simplifies code in the drivers and makes them more robust when handling shared IRQs. Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Cc: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -636,6 +636,9 @@ enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer)
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void rtc_update_irq(struct rtc_device *rtc,
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unsigned long num, unsigned long events)
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{
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if (unlikely(IS_ERR_OR_NULL(rtc)))
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return;
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pm_stay_awake(rtc->dev.parent);
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schedule_work(&rtc->irqwork);
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}
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