Re: [patch 1/3] libata: check for AN support

[Jeff Garzik]

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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