powerpc: pseries: remove dlpar_attach_node dependency on full path

In preparation to stop storing the full node path in full_name, remove the
dependency on full_name from dlpar_attach_node(). Callers of
dlpar_attach_node() already have the parent device_node, so just pass the
parent node into dlpar_attach_node instead of the path. This avoids doing
a lookup of the parent node by the path.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/pseries/dlpar.c

@@ -254,13 +254,11 @@ cc_error:
 	return first_dn;
 }
 
-int dlpar_attach_node(struct device_node *dn)
+int dlpar_attach_node(struct device_node *dn, struct device_node *parent)
 {
 	int rc;
 
-	dn->parent = pseries_of_derive_parent(dn->full_name);
-	if (IS_ERR(dn->parent))
-		return PTR_ERR(dn->parent);
+	dn->parent = parent;
 
 	rc = of_attach_node(dn);
 	if (rc) {

arch/powerpc/platforms/pseries/hotplug-cpu.c

@@ -463,7 +463,7 @@ static ssize_t dlpar_cpu_add(u32 drc_index)
 		return -EINVAL;
 	}
 
-	rc = dlpar_attach_node(dn);
+	rc = dlpar_attach_node(dn, parent);
 	if (rc) {
 		saved_rc = rc;
 		pr_warn("Failed to attach node %s, rc: %d, drc index: %x\n",

arch/powerpc/platforms/pseries/mobility.c

@@ -229,7 +229,7 @@ static int add_dt_node(__be32 parent_phandle, __be32 drc_index)
 	if (!dn)
 		return -ENOENT;
 
-	rc = dlpar_attach_node(dn);
+	rc = dlpar_attach_node(dn, parent_dn);
 	if (rc)
 		dlpar_free_cc_nodes(dn);
 

arch/powerpc/platforms/pseries/pseries.h

@@ -46,7 +46,7 @@ extern void dlpar_free_cc_nodes(struct device_node *);
 extern void dlpar_free_cc_property(struct property *);
 extern struct device_node *dlpar_configure_connector(__be32,
 						struct device_node *);
-extern int dlpar_attach_node(struct device_node *);
+extern int dlpar_attach_node(struct device_node *, struct device_node *);
 extern int dlpar_detach_node(struct device_node *);
 extern int dlpar_acquire_drc(u32 drc_index);
 extern int dlpar_release_drc(u32 drc_index);