Hi Tejun, On Mon, May 4, 2015 at 11:56 PM, Tejun Heo <tj@xxxxxxxxxx> wrote: > 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. Yeah it's very simple. The clearing of irq_stat needs to move up. That's it. tried and it worked. Thanks a lot !! Just a quick question : Why edge trigger handling is not yet present in libahci yet? I mean no one has used it yet ?? > > Thanks. > > -- > tejun -- Thanks, with regards, Suman Tripathi -- 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
