[PATCH 3/3] Improve robustness of the UIC cascade handler

[David Gibson]

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 at ru.mvista.com>
Signed-off-by: David Gibson <david at gibson.dropbear.id.au>

---
 arch/powerpc/sysdev/uic.c |    3 +++
 1 file changed, 3 insertions(+)

Index: working-2.6/arch/powerpc/sysdev/uic.c
===================================================================
--- working-2.6.orig/arch/powerpc/sysdev/uic.c	2007-08-14 13:46:02.000000000 +1000
+++ working-2.6/arch/powerpc/sysdev/uic.c	2007-08-14 13:46:02.000000000 +1000
@@ -266,6 +266,9 @@ irqreturn_t uic_cascade(int virq, void *
 	int subvirq;
 
 	msr = mfdcr(uic->dcrbase + UIC_MSR);
+	if (!msr) /* spurious interrupt */
+		return IRQ_HANDLED;
+
 	src = 32 - ffs(msr);
 
 	subvirq = irq_linear_revmap(uic->irqhost, src);