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Re: [Q] PCI Express and ide (native) leads to irq storm? [message #8326 is a reply to message #8322] Wed, 15 November 2006 18:49 Go to previous messageGo to previous message
Jeff Garzik is currently offline  Jeff Garzik
Messages: 9
Registered: February 2006
Junior Member
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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