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SubjectRe: [patch 1/3] libata: check for AN support
Tejun Heo wrote:
> Kristen Carlson Accardi wrote:
>> Check to see if an ATAPI device supports Asynchronous Notification.
>> If so, enable it.
>
> As supporting AN needs host interrupt handler change. I think we need
> host-supports-AN flag; otherwise, we might end up with screaming
> interrupts in the worst case.

Quite so. Lacking a host flag, we need to know how each and every
controller behaves when AN is activated (and supported by the device).
I'm willing to bet some of the first-gen SATA controllers' ASIC state
machines croak when AN is activated.

Jeff



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