From: Mika Westerberg mika.westerberg@linux.intel.com
commit c94732bda079ee66b5c3904cbb628d0cb218ab39 upstream.
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: 6ac6faee5d7d ("thunderbolt: Add runtime PM for Software CM") Cc: stable@vger.kernel.org Signed-off-by: Mika Westerberg mika.westerberg@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/thunderbolt/tb.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -138,6 +138,10 @@ static void tb_discover_tunnels(struct t 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);