tree 6d87847e2ee77bb60ada7c3dee2158af93352a7b
parent 868afce21fdadcecc7bde9263321065948508c56
author David Gibson <david@gibson.dropbear.id.au> 1187063562 +1000
committer Paul Mackerras <paulus@samba.org> 1187312526 +1000

[POWERPC] Improve robustness of the UIC cascade handler

At present the cascade interrupt handler for the UIC (interrupt
controller on 4xx embedded chips) will misbehave badly if it is called
spuriously - that is if the handler is invoked when no interrupts are
asserted in the child UIC.

Although spurious interrupts shouldn't happen, it's good to behave
robustly if they do.  This patch does so by checking for and ignoring
spurious interrupts.

Signed-off-by: Valentine Barshak <vbarshak@ru.mvista.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>