1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index f1b6100b6cf0..3b716fd123f6 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -11,6 +11,47 @@
 #include "tb.h"
 #include "tb_regs.h"
 
+
+/* enumeration & hot plug handling */
+
+
+static void tb_scan_port(struct tb_port *port);
+
+/**
+ * tb_scan_switch() - scan for and initialize downstream switches
+ */
+static void tb_scan_switch(struct tb_switch *sw)
+{
+        int i;
+        for (i = 1; i <= sw->config.max_port_number; i++)
+                tb_scan_port(&sw->ports[i]);
+}
+
+/**
+ * tb_scan_port() - check for and initialize switches below port
+ */
+static void tb_scan_port(struct tb_port *port)
+{
+        struct tb_switch *sw;
+        if (tb_is_upstream_port(port))
+                return;
+        if (port->config.type != TB_TYPE_PORT)
+                return;
+        if (tb_wait_for_port(port, false) <= 0)
+                return;
+        if (port->remote) {
+                tb_port_WARN(port, "port already has a remote!\n");
+                return;
+        }
+        sw = tb_switch_alloc(port->sw->tb, tb_downstream_route(port));
+        if (!sw)
+                return;
+        port->remote = tb_upstream_port(sw);
+        tb_upstream_port(sw)->remote = port;
+        tb_scan_switch(sw);
+}
+
+
 /* hotplug handling */
 
 struct tb_hotplug_event {
@@ -134,6 +175,9 @@ struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi)
         if (!tb->root_switch)
                 goto err_locked;
 
+        /* Full scan to discover devices added before the driver was loaded. */
+        tb_scan_switch(tb->root_switch);
+
         /* Allow tb_handle_hotplug to progress events */
         tb->hotplug_active = true;
         mutex_unlock(&tb->lock);