Hello, On Mon, May 04, 2015 at 10:13:11PM +0530, Suman Tripathi wrote: > AFAIK clearing host_irq_stat means we have handled port interrupts . > Now for our case we still have interrupts left because it didn't get > detected on > first ahci_port_intr. So you mean to handle that residual irq in the > next cycle (i mean next call intr handler ) ?? Heh, I think we're talking past each other. For level triggered IRQs, the latched IRQ bits should be cleared after handling the events; otherwise, the latched bits are gonna get set immediately as the events are still pending. Also, this doesn't lose any events as they're level triggered latches - if any event is pending, the IRQ is gonna be raised again. Edge triggered latches are the other way around. You should clear the latches before actually handling and clearing the events. The pending events won't trigger the latches again as it's edge-triggered and the events which happens after this irq handling starts won't get lost as they'll be latched for the next round. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
