John, I've been fighting with this as well. So far
what I've done is the following:
void interrupt_handler( int irq, struct pt_regs *regs ) {
if( board_being_used ) {
irqs = test_board_for_pending_irqs();
if( irqs ) {
clear_irqs_on_board();
/* handle interrupt */
rtl_hard_enable_irq( irq );
}
}
else
clear_irqs_on_board();
rtl_gloabl_pend_irq( irq );
}
The above works for a little while, but I still get lock-ups
every now and then. However, I'm not 100% sure that my interrupt
handler is the cause (any comments on the above code?).
I think what you're missing in the rtl_global_pend_irq().
> -----Original Message-----
> From: Seybold, John B [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, September 19, 2002 4:08 PM
> To: '[EMAIL PROTECTED]'
> Subject: [Rtl]shared IRQ and RTLinux interrupt handlers
>
>
> For reasons we don't understand, the plug & play system moved
> the IRQ for
> our custom board to share an IRQ with the Ethernet
> controller. Now when we
> try to install our custom RTLinux module the Ethernet interface dies.
>
> We looked in ...MAN\rtl_request_irq.3.html, which says "If it
> is necessary
> to receive further interrupts from this device, you must reenable the
> interrupt line with the rtl_hard_enable_irq(3) function.";
> after the reply
> by Yodaiken on 9/12, it sounds like this sentence was meant
> to cover only
> highly unusual cases, and a normal RTLinux interrupt handler
> should just
> handle and clear the associated interrupt source and then
> return. Right??
>
> Even if we leave the interrupts on our custom board disabled
> and install an
> interrupt handler that just executes a return 0, installing
> the module with
> a shared IRQ still kills the Ethernet interface that shares the IRQ.
>
> Do we need to do anything in our interrupt handler to support shared
> interrupts?
>
> Is there anything that we can do to force a unique IRQ for
> our plug and play
> board?
>
> Thanks
> John
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