[PATCH] drivers/net/wan/z85230.c interrupt handling fix

From: tom watson <lkml@tommywatson.com>

While working on a driver for z85230 based board I noticed what looks like
it could be a problem.  If the interrupt handler is handling an interrupt
on port b and an interrupt comes in for port a, it seems to me that the
port b handler would be called instead of the port a handler, and possibly
hang the board until reset.

Attached is a patch to set the irq methods back to port a before attempting
to call them.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

drivers/net/wan/z85230.c

@@ -734,7 +734,7 @@ irqreturn_t z8530_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 	u8 intr;
 	static volatile int locker=0;
 	int work=0;
-	struct z8530_irqhandler *irqs=dev->chanA.irqs;
+	struct z8530_irqhandler *irqs;
 	
 	if(locker)
 	{
@@ -758,6 +758,8 @@ irqreturn_t z8530_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 		/* Now walk the chip and see what it is wanting - it may be
 		   an IRQ for someone else remember */
 		   
+		irqs=dev->chanA.irqs;
+
 		if(intr & (CHARxIP|CHATxIP|CHAEXT))
 		{
 			if(intr&CHARxIP)