thunderbolt: Do not unnecessarily call ICM get route

This command is not really fast and can make resume time slower. We only
need to get route again if the link was changed and during initial
device connected message.
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/thunderbolt/icm.c

@@ -534,20 +534,13 @@ icm_fr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr)
 		return;
 	}
 
-	ret = icm->get_route(tb, link, depth, &route);
-	if (ret) {
-		tb_err(tb, "failed to find route string for switch at %u.%u\n",
-		       link, depth);
-		return;
-	}
-
 	sw = tb_switch_find_by_uuid(tb, &pkg->ep_uuid);
 	if (sw) {
 		u8 phy_port, sw_phy_port;
 
 		parent_sw = tb_to_switch(sw->dev.parent);
-		sw_phy_port = phy_port_from_route(tb_route(sw), sw->depth);
-		phy_port = phy_port_from_route(route, depth);
+		sw_phy_port = tb_phy_port_from_link(sw->link);
+		phy_port = tb_phy_port_from_link(link);
 
 		/*
 		 * On resume ICM will send us connected events for the
@@ -559,6 +552,22 @@ icm_fr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr)
 		 */
 		if (sw->depth == depth && sw_phy_port == phy_port &&
 		    !!sw->authorized == authorized) {
+			/*
+			 * It was enumerated through another link so update
+			 * route string accordingly.
+			 */
+			if (sw->link != link) {
+				ret = icm->get_route(tb, link, depth, &route);
+				if (ret) {
+					tb_err(tb, "failed to update route string for switch at %u.%u\n",
+					       link, depth);
+					tb_switch_put(sw);
+					return;
+				}
+			} else {
+				route = tb_route(sw);
+			}
+
 			update_switch(parent_sw, sw, route, pkg->connection_id,
 				      pkg->connection_key, link, depth, boot);
 			tb_switch_put(sw);
@@ -607,6 +616,14 @@ icm_fr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr)
 		return;
 	}
 
+	ret = icm->get_route(tb, link, depth, &route);
+	if (ret) {
+		tb_err(tb, "failed to find route string for switch at %u.%u\n",
+		       link, depth);
+		tb_switch_put(parent_sw);
+		return;
+	}
+
 	add_switch(parent_sw, route, &pkg->ep_uuid, pkg->connection_id,
 		   pkg->connection_key, link, depth, security_level,
 		   authorized, boot);