Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

Alan Cox
2001-01-13T00:42:30Z

> interrupt_handler()
> {
> status = readl(dev->status);
> if (status & MY_IRQ_DISABLE)
> return;

Unfortunately on the 8390 the IRQ statud register is on page 0. The code
on the other CPU might not be on page 0. That means we can't even safely
check if there is an irq pending or clear it down (bad news on ne2k-pci)
without getting that lock.

That means we have to be able to just block that one irq source to avoid
horrible SMP latency problems.

Alan