pata_mpc52xx supports BMDMA but inherits ata_sff_port_ops which
triggers BUG_ON() when a DMA command is issued.  Fix it.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Roman Fietze <roman.fietze@telemotive.de>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
Cc: stable@kernel.org
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
 };
 
 static struct ata_port_operations mpc52xx_ata_port_ops = {
-       .inherits               = &ata_sff_port_ops,
+       .inherits               = &ata_bmdma_port_ops,
        .sff_dev_select         = mpc52xx_ata_dev_select,
        .set_piomode            = mpc52xx_ata_set_piomode,
        .set_dmamode            = mpc52xx_ata_set_dmamode,