thunderbolt: Do not tear down tunnels when driver is unloaded

Now that we have capability to discover existing tunnels during driver
load there is no point tearing down tunnels when the driver gets
unloaded. Instead we can just leave them running. If user disconnects
devices while there is no Thunderbolt driver loaded, tunneled protocol
hotplug happens and is handled by the corresponding driver (pciehp in
case of PCIe tunnel, GFX driver in case of DP tunnel).
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/thunderbolt/path.c

@@ -304,17 +304,15 @@ struct tb_path *tb_path_alloc(struct tb *tb, struct tb_port *src, int src_hopid,
 }
 
 /**
- * tb_path_free() - free a deactivated path
+ * tb_path_free() - free a path
+ * @path: Path to free
+ *
+ * Frees a path. The path does not need to be deactivated.
  */
 void tb_path_free(struct tb_path *path)
 {
 	int i;
 
-	if (path->activated) {
-		tb_WARN(path->tb, "trying to free an activated path\n")
-		return;
-	}
-
 	for (i = 0; i < path->path_length; i++) {
 		const struct tb_path_hop *hop = &path->hops[i];
 

drivers/thunderbolt/tb.c

@@ -500,10 +500,8 @@ static void tb_stop(struct tb *tb)
 	struct tb_tunnel *n;
 
 	/* tunnels are only present after everything has been initialized */
-	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
-		tb_tunnel_deactivate(tunnel);
+	list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list)
 		tb_tunnel_free(tunnel);
-	}
 	tb_switch_remove(tb->root_switch);
 	tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
 }

drivers/thunderbolt/tunnel.c

@@ -475,7 +475,7 @@ struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
  * tb_tunnel_free() - free a tunnel
  * @tunnel: Tunnel to be freed
  *
- * The tunnel must have been deactivated.
+ * Frees a tunnel. The tunnel does not need to be deactivated.
  */
 void tb_tunnel_free(struct tb_tunnel *tunnel)
 {
@@ -484,14 +484,6 @@ void tb_tunnel_free(struct tb_tunnel *tunnel)
 	if (!tunnel)
 		return;
 
-	for (i = 0; i < tunnel->npaths; i++) {
-		if (tunnel->paths[i] && tunnel->paths[i]->activated) {
-			tb_tunnel_WARN(tunnel,
-				       "trying to free an activated tunnel\n");
-			return;
-		}
-	}
-
 	for (i = 0; i < tunnel->npaths; i++) {
 		if (tunnel->paths[i])
 			tb_path_free(tunnel->paths[i]);