Michael> Why does it "totally break" it? We did suppress the
Michael> interrupt (write to clear interrupt register) so we
Michael> return "HANDLED". Its unavoidable that hardware may
Michael> re-assert it while the handler is still running.
Because the purpose of the IRQ_HANDLED return value is to tell the
kernel that our device did indeed generate the interrupt. If the
interrupt is shared with another device with a stuck interrupt then
always returning IRQ_HANDLED from our handler will prevent the kernel
from detecting the stuck interrupt.
- R.
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