Gary Zambrano wrote:

The b44 interrupt status reg returns a value of 0 if no interrupts are
pending. The b44 uses a mask to determine which bits (events) can
generate device interrupts on the system. If the masked interrupt status
register bits are not asserted, then the b44 will return to the system
with handled = 0. 
So, I think the way the b44 interrupt code is written should be ok and
not a bug. 

This is normal.

We check for 0xffffffff because that is often how a fault is indicated, 
when the memory location is read during or immediately after hotplug (or 
if the PCI bus is truly faulty).  So for most hardware, you see

tmp = read(irq status)
if (!tmp)
	return irq-none		/* no irq events raised */
if (tmp == 0xffffffff)
	return irq-none		/* hot unplug or h/w fault */

and the method that determines no interrupt handling is needed.

Regards,

	Jeff