From: Mika Westerberg <mika.westerberg@linux.intel.com>
Date: Mon, 7 Jun 2021 10:37:46 +0000 (+0300)
Subject: thunderbolt: Bond lanes only when dual_link_port != NULL in alloc_dev_default()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a0d36fa1065901f939b04587a09c65303a64ac88;p=linux.git

thunderbolt: Bond lanes only when dual_link_port != NULL in alloc_dev_default()

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@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Yehezkel Bernat <YehezkelShB@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---

diff --git a/drivers/thunderbolt/test.c b/drivers/thunderbolt/test.c
index cf34c1ecf5d51..ba5afd4717661 100644
--- a/drivers/thunderbolt/test.c
+++ b/drivers/thunderbolt/test.c
@@ -303,18 +303,18 @@ 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->total_credits *= 2;
-		port->dual_link_port->bonded = true;
-		port->dual_link_port->total_credits = 0;
-		upstream_port->bonded = true;
-		upstream_port->total_credits *= 2;
-		upstream_port->dual_link_port->bonded = true;
-		upstream_port->dual_link_port->total_credits = 0;
+		if (bonded) {
+			/* Bonding is used */
+			port->bonded = true;
+			port->total_credits *= 2;
+			port->dual_link_port->bonded = true;
+			port->dual_link_port->total_credits = 0;
+			upstream_port->bonded = true;
+			upstream_port->total_credits *= 2;
+			upstream_port->dual_link_port->bonded = true;
+			upstream_port->dual_link_port->total_credits = 0;
+		}
 	}
 
 	return sw;