... rumours deleted (e.g. "printer status bits are all ORed into irq7")
If no interrupt request is present at step 4 of either sequence
(i.e., the request was too short in duration), the 82C59A will
issue an interrupt level 7.
1. The irq controller sees an interrupt.
2. The irq controller signals "there is _some_ interrupt" to the cpu.
3. The CPU acks via INTA
4. The irq controller looks if the irq is still there
(and signals IRQ7 if the line is no longer active).
You have some device which doesn't keep the IRQ raised long enough !
(or the CPU doesn't service the irq for a too long time and the
edge triggered irq is de-asserted or even serviced by a polling routine)
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to email@example.com
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/