[PATCH] ata_piix: add host_set private structure
Add host_set private structure piix_host_priv. Currently the only field is ->map which used to be stored directly at host_set->private_data. This change allows more host_set private fields to be added. Signed-off-by: NTejun Heo <htejun@gmail.com> Signed-off-by: NJeff Garzik <jeff@garzik.org>
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