libata: implement ata_host_detach()

Implement ata_host_detach() which calls ata_port_detach() for each
port in the host and export it.  ata_port_detach() is now internal and
thus un-exported.  ata_host_detach() will be used as the 'deregister
from libata layer' function after devres conversion.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/ata/ahci.c

@@ -1792,8 +1792,7 @@ static void ahci_remove_one (struct pci_dev *pdev)
 	unsigned int i;
 	int have_msi;
 
-	for (i = 0; i < host->n_ports; i++)
-		ata_port_detach(host->ports[i]);
+	ata_host_detach(host);
 
 	have_msi = hpriv->flags & AHCI_FLAG_MSI;
 	free_irq(host->irq, host);

drivers/ata/libata-core.c

@@ -5991,6 +5991,23 @@ void ata_port_detach(struct ata_port *ap)
 	scsi_remove_host(ap->scsi_host);
 }
 
+/**
+ *	ata_host_detach - Detach all ports of an ATA host
+ *	@host: Host to detach
+ *
+ *	Detach all ports of @host.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_host_detach(struct ata_host *host)
+{
+	int i;
+
+	for (i = 0; i < host->n_ports; i++)
+		ata_port_detach(host->ports[i]);
+}
+
 /**
  *	ata_host_remove - PCI layer callback for device removal
  *	@host: ATA host set that was removed
@@ -6006,8 +6023,7 @@ void ata_host_remove(struct ata_host *host)
 {
 	unsigned int i;
 
-	for (i = 0; i < host->n_ports; i++)
-		ata_port_detach(host->ports[i]);
+	ata_host_detach(host);
 
 	free_irq(host->irq, host);
 	if (host->irq2)
@@ -6382,7 +6398,7 @@ EXPORT_SYMBOL_GPL(ata_std_bios_param);
 EXPORT_SYMBOL_GPL(ata_std_ports);
 EXPORT_SYMBOL_GPL(ata_host_init);
 EXPORT_SYMBOL_GPL(ata_device_add);
-EXPORT_SYMBOL_GPL(ata_port_detach);
+EXPORT_SYMBOL_GPL(ata_host_detach);
 EXPORT_SYMBOL_GPL(ata_host_remove);
 EXPORT_SYMBOL_GPL(ata_sg_init);
 EXPORT_SYMBOL_GPL(ata_sg_init_one);

include/linux/libata.h

@@ -719,7 +719,7 @@ extern int ata_pci_device_resume(struct pci_dev *pdev);
 extern int ata_pci_clear_simplex(struct pci_dev *pdev);
 #endif /* CONFIG_PCI */
 extern int ata_device_add(const struct ata_probe_ent *ent);
-extern void ata_port_detach(struct ata_port *ap);
+extern void ata_host_detach(struct ata_host *host);
 extern void ata_host_init(struct ata_host *, struct device *,
 			  unsigned long, const struct ata_port_operations *);
 extern void ata_host_remove(struct ata_host *host);