[Devel] Re: [Q] PCI Express and ide (native) leads to irq storm?

[Jeff Garzik]

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