[PATCH 5.12 610/700] thunderbolt: Bond lanes only when dual_link_port != NULL in alloc_dev_default()

[Greg Kroah-Hartman]

From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>

[ Upstream commit a0d36fa1065901f939b04587a09c65303a64ac88 ]

We should not dereference ->dual_link_port if it is NULL and lane bonding
is requested. For this reason move lane bonding configuration happen
inside the block where ->dual_link_port != NULL.

Fixes: 54509f5005ca ("thunderbolt: Add KUnit tests for path walking")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Yehezkel Bernat <YehezkelShB@xxxxxxxxx>
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/thunderbolt/test.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/thunderbolt/test.c b/drivers/thunderbolt/test.c
index 464c2d37b992..e254f8c37cb7 100644
--- a/drivers/thunderbolt/test.c
+++ b/drivers/thunderbolt/test.c
@@ -259,14 +259,14 @@ static struct tb_switch *alloc_dev_default(struct kunit *test,
 	if (port->dual_link_port && upstream_port->dual_link_port) {
 		port->dual_link_port->remote = upstream_port->dual_link_port;
 		upstream_port->dual_link_port->remote = port->dual_link_port;
-	}
 
-	if (bonded) {
-		/* Bonding is used */
-		port->bonded = true;
-		port->dual_link_port->bonded = true;
-		upstream_port->bonded = true;
-		upstream_port->dual_link_port->bonded = true;
+		if (bonded) {
+			/* Bonding is used */
+			port->bonded = true;
+			port->dual_link_port->bonded = true;
+			upstream_port->bonded = true;
+			upstream_port->dual_link_port->bonded = true;
+		}
 	}
 
 	return sw;
-- 
2.30.2