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We have a proprietary PCIe board that runs a KMDF based driver that interrupts every 60ms when running.
After running overnight we detected that WdfInterruptQueueDpcForIsr, at the end of our ISR, returns false.
My interpretation of this is that the DPC queue/list already has a queued DPC for our PCIe device and the queue can only have one queued DPC per device?
Which leads me to the following question what can cause this to occur? The processing times for our interrupt and DPC are fairly quick and nowhere near 60ms.
Also what action should a driver take, if any, when WdfInterruptQueueDpcForIsr returns false?
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