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I've got a device that has a really slow bus for communicating with a specific piece of hardware. Communication over this bus happens at initialization, on a settings change (initiated through an IOCTL), and when the hardware generates an IRQ. The ISR queues a DPC to handle the IRQ. However, in the rare event that the user was in the middle of a settings change I need to synchronize access to the bus such that the IOCTL completes before the DPC handles the IRQ.
What's the recommended synchronization strategy for such a scenario? The
EvtIoDeviceControl callback is configured as
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