Hi all,

the current ahci doesn't handle suspend / resume cycles too well.
On certain machines the disk just locks up and refuses to work after a
resume.

This is due to a initialisation error after resume; ahci has for
registers containing DMA addresses (which are obviously allocated by the
kernel). Of course there is no guarantee that these addresses are
unchanged across reboots. So ahci loads the suspended image, and after
the suspended image is started the driver is presented with different
DMA addresses, whereas the chip still uses the original ones.

This patch rearranges the suspend / resume code to properly initialise
those registers after a resume. It also contains some initialisation
fixes to make the driver behave more spec-compliant.

Comments etc. are welcome.

Oh, patch is against linux-2.6 git.
Please apply.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke			hare@suse.de
SuSE Linux Products GmbH		S390 & zSeries
Maxfeldstraße 5				+49 911 74053 688
90409 Nürnberg				http://www.suse.de