thunderbolt: Send uevent after asymmetric/symmetric switch

commit 5391bcf upstream.

We should send uevent to userspace whenever the link speed or width
changes but tb_switch_asym_enable() and tb_switch_asym_disable() set the
sw->link_width already so tb_switch_update_link_attributes() never
noticed the change.

Fix this so that we let tb_switch_update_link_attributes() update the
fields accordingly.

Fixes: 81af295 ("thunderbolt: Add support for asymmetric link")
Reported-by: Pengfei Xu <[email protected]>
Tested-by: Pengfei Xu <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

drivers/thunderbolt/switch.c

@@ -2981,6 +2981,7 @@ static int tb_switch_lane_bonding_disable(struct tb_switch *sw)
 	return tb_port_wait_for_link_width(down, TB_LINK_WIDTH_SINGLE, 100);
 }
 
+/* Note updating sw->link_width done in tb_switch_update_link_attributes() */
 static int tb_switch_asym_enable(struct tb_switch *sw, enum tb_link_width width)
 {
 	struct tb_port *up, *down, *port;
@@ -3020,10 +3021,10 @@ static int tb_switch_asym_enable(struct tb_switch *sw, enum tb_link_width width)
 			return ret;
 	}
 
-	sw->link_width = width;
 	return 0;
 }
 
+/* Note updating sw->link_width done in tb_switch_update_link_attributes() */
 static int tb_switch_asym_disable(struct tb_switch *sw)
 {
 	struct tb_port *up, *down;
@@ -3058,7 +3059,6 @@ static int tb_switch_asym_disable(struct tb_switch *sw)
 			return ret;
 	}
 
-	sw->link_width = TB_LINK_WIDTH_DUAL;
 	return 0;
 }