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[2/2] thunderbolt: Increase runtime PM reference count on DP tunnel discovery

Message ID 20210303121310.80937-2-mika.westerberg@linux.intel.com
State New
Headers show
Series [1/2] thunderbolt: Initialize HopID IDAs in tb_switch_alloc() | expand

Commit Message

Mika Westerberg March 3, 2021, 12:13 p.m. UTC 
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>
---
 drivers/thunderbolt/tb.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 1f000ac1728b..c348b1fc0efc 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -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);