The original commit's assumption that the secondary port is
unconnected turns out to be false.
Signed-off-by: Tejun Heo <[email protected]> Reported-by: Markku Pesonen <[email protected]> Fixes: 5946fdaee4ba ("pata_atiixp: Don't use unconnected secondary port on SB600/SB700") Cc: Darren Stevens <[email protected]>