Am 26.10.2010 07:22, Jan Kiszka wrote: > Will come up with two patches for stable, one for I-pipe and one for > Xenomai, later today. Then we can discuss which cases I'm missing.
While meditating over my approach (which turned out to be less trivial as expected - of course), I also reconsidered your current patches. The concerns I had (forwarding of spurious IRQ to Linux) turned out to be harmless (Linux will ignore such few spurious events). Still, the approach to sync via shutting down the line for the current domain before xnintr_irq_detach doesn't work for us. It only works if xnintr_irq_detach actually detaches from the line, but it breaks if there are users remaining. We need intrlock to check if we are the last user while removing ourselves from the list. And we cannot postpone line detaching after the critical section as we may otherwise race with the next registration on that line. IOW, I don't see how to solve the issue without moving the drain after the detach and making the detach safer instead. Do you agree? Jan
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