ARM interrupts fixes

[Sam Leffler]

Rafal Jaworowski wrote:
> Hi,
> Please review the following changes around interrupts handling in ARM. We
> already started discussing these items with Olivier some time ago:
>
> 1. http://people.freebsd.org/~raj/patches/arm/intr-fixes.diff
>
> At the moment nexus_setup_intr() attempts to set up a number of IRQs in one
> take, calling arm_setup_irqhandler() in loop. This is bogus, as there's just
> one cookie given from the caller and it is overwritten in each iteration so
> that only the last handler's cookie value prevails...
>
> This patch removes such behaviour, however there's one [mis]user of the old
> approach  i.e. the IXP425 qmgr, which needs adjustments too, see p.2.
>
> Apart from style fixes, another problem which is corrected in this patch is
> the unmasking the IRQ source in the PIC after the last handler has been
> removed from list.
>
>
> 2. http://people.freebsd.org/~raj/patches/arm/sys-arm-xscale-ixp425.diff
>
> This splits handling of the two QMGR interrupts so they are explicitly
> managed, as typically done in cases when there are a number of physical IRQs
> used by one driver. I don't have IXP425 hardware and was able to only
> compile-test it, so any help with real h/w testing would be appreciated.
>
> Let me know your comments.
>   
The qmgr stuff looks fine; don't have time right now to look carefully 
at the other patch.

    Sam