ahci: fix notification handling
Asynchronous notification on ICH9 didn't work because it didn't write AN FIS into the RX area - it only updates SNotification. Also, snooping SDB_FIS RX area is racy against further SDB FIS receptions. Let sata_async_notification() determine using SNTF if it's available and snoop RX area iff SNTF isn't available Signed-off-by: NTejun Heo <htejun@gmail.com> Cc: Kristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: NJeff Garzik <jeff@garzik.org>
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