[libata] add ->host_stop hook, and copy ->private_data from probe_ent

drivers/scsi/libata-core.c

@@ -2849,6 +2849,7 @@ int ata_device_add(struct ata_probe_ent *ent)
 	host_set->n_ports = ent->n_ports;
 	host_set->irq = ent->irq;
 	host_set->mmio_base = ent->mmio_base;
+	host_set->private_data = ent->private_data;
 
 	/* register each port bound to this device */
 	for (i = 0; i < ent->n_ports; i++) {
@@ -3191,6 +3192,8 @@ void ata_pci_remove_one (struct pci_dev *pdev)
 	free_irq(host_set->irq, host_set);
 	if (host_set->mmio_base)
 		iounmap(host_set->mmio_base);
+	if (host_set->ports[0]->ops->host_stop)
+		host_set->ports[0]->ops->host_stop(host_set);
 
 	for (i = 0; i < host_set->n_ports; i++) {
 		Scsi_Host_Template *sht;

include/linux/libata.h

@@ -207,6 +207,7 @@ struct ata_probe_ent {
 	unsigned int		irq_flags;
 	unsigned long		host_flags;
 	void			*mmio_base;
+	void			*private_data;
 };
 
 struct ata_host_set {
@@ -371,6 +372,8 @@ struct ata_port_operations {
 
 	int (*port_start) (struct ata_port *ap);
 	void (*port_stop) (struct ata_port *ap);
+
+	void (*host_stop) (struct ata_host_set *host_set);
 };
 
 struct ata_port_info {