[SPARC64]: Fix domain-services port probing.

We should only use ports underneath "domain-services", other DS ports
in the MDESC aren't for us to use.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 26 insertions, 1 deletions

diff --git a/arch/sparc64/kernel/vio.c b/arch/sparc64/kernel/vio.c
index 1550ac5673da..830dc88c19c9 100644
--- a/arch/sparc64/kernel/vio.c
+++ b/arch/sparc64/kernel/vio.c
@@ -342,8 +342,33 @@ static struct mdesc_notifier_client vio_device_notifier = {
         .node_name      = "virtual-device-port",
 };
 
+/* We are only interested in domain service ports under the
+ * "domain-services" node.  On control nodes there is another port
+ * under "openboot" that we should not mess with as aparently that is
+ * reserved exclusively for OBP use.
+ */
+static void vio_add_ds(struct mdesc_handle *hp, u64 node)
+{
+        int found;
+        u64 a;
+
+        found = 0;
+        mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
+                u64 target = mdesc_arc_target(hp, a);
+                const char *name = mdesc_node_name(hp, target);
+
+                if (!strcmp(name, "domain-services")) {
+                        found = 1;
+                        break;
+                }
+        }
+
+        if (found)
+                (void) vio_create_one(hp, node, &root_vdev->dev);
+}
+
 static struct mdesc_notifier_client vio_ds_notifier = {
-        .add            = vio_add,
+        .add            = vio_add_ds,
         .remove         = vio_remove,
         .node_name      = "domain-services-port",
 };