Commit c94732bd authored Dec 10, 2020 by Mika Westerberg

thunderbolt: Increase runtime PM reference count on DP tunnel discovery



If the driver is unbound and then bound back it goes over the topology
and figure out the existing tunnels. However, if it finds DP tunnel it
should make sure the domain does not runtime suspend as otherwise it
will tear down the DP tunnel unexpectedly.

Fixes: 6ac6faee ("thunderbolt: Add runtime PM for Software CM")
Cc: stable@vger.kernel.org
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

parent 781e14ea

drivers/thunderbolt/tb.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -138,6 +138,10 @@ static void tb_discover_tunnels(struct tb_switch *sw)
		parent->boot = true;
		parent = tb_switch_parent(parent);
		}
		} else if (tb_tunnel_is_dp(tunnel)) {
		/* Keep the domain from powering down */
		pm_runtime_get_sync(&tunnel->src_port->sw->dev);
		pm_runtime_get_sync(&tunnel->dst_port->sw->dev);
		}

		list_add_tail(&tunnel->list, &tcm->tunnel_list);