Messages in this thread | | | Date | Wed, 15 Nov 2006 13:49:21 -0500 | From | Jeff Garzik <> | Subject | Re: [Q] PCI Express and ide (native) leads to irq storm? |
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Tejun Heo wrote: > In short, some piix controllers including ICH7, when put into enhanced > mode (PCI native mode), uses BMDMA Interrupt bit as interrupt > pending/clear bit for *all* commands. ie. Reading STATUS does NOT clear
Yep. I thought I had mentioned this, ages ago.
> Fortunately, libata is immune to the problem because it does > ap->ops->irq_clear(ap) in ata_host_intr() regardless of command type in > flight. So, not loading IDE piix and using libata to drive all piix > ports solves the problem.
Yep, that's intentional :)
Jeff
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