The attached patch changes libata device scanning from using the legacy 
"bang at the door" method of probing devices, to one that calls 
scsi_scan_target() for each target (ATA device) that the libata 
transport layer found.

Completely untested, feedback welcome.  This should improve the speed of 
SATA probing a tad, and certainly makes it quite a bit less ugly.

This might get moved, eventually, into an ATA transport class, depending 
on how things shape up in the future.

	Jeff