On Fri, Apr 27, 2012 at 11:28:28AM -0400, Mark Asselstine wrote: > On April 26, 2012 22:52:58 Russell King - ARM Linux wrote: > > What is the effect when the supplied IRQ does not have a mapping to a > > GPIO - or it _does_ by way of a badly coded irq_to_gpio() function > > but that GPIO is not the correct one. > > There is no prevention against endlessly looping, so it could cause a > > system lockup. > Unfortunately the commit [b1148fd4 mfd: fix pcap irq bottom handler > ] which modified things to loop as long as the interrupt is asserted didn't > supply much information regarding the behavior they were trying to achieve/fix > nor what would be the consequence of bailing earlier. The usual reason for this pattern is to simulate level triggered IRQs on an edge triggered interrupt controller. -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
