undefined IRQs in request_irq

Paul Mackerras paulus at au1.ibm.com
Thu Sep 19 10:49:11 EST 2002

Mark Chambers writes:

> I wrote a driver for our custom MPC860 platform that we've ported linux 2.4.19
> to.  When I insmod'd the driver it produced a kernel panic.  I traced it to
> request_irq() in ppc8xx_pic.c, where the code calls panic() if the requested
> irq is anything other than IDEx_INTERRUPT.  I fixed my problem by just adding
> another case.
> First, it seems extreme to me to crash the system instead of just refusing the
> request.  Am I missing something?

No.  IMO the current request_8xxirq / request_irq stuff is completely
bogus.  I can understand it as a temporary construction while
debugging stuff, but it has long outlived its usefulness.  We should
just use request_irq for everything, request_8xxirq should die.


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