Merge tag 'thunderbolt-for-v6.8-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into usb-linus

Mika writes:

thunderbolt: Fix for v6.8-rc7

This includes one USB4/Thunderbolt fix for v6.8-rc7:

  - Fix NULL pointer dereference in tb_port_update_credits() on
    Apple Thunderbolt 1 hardware.

This has been in linux-next with no reported issues.

* tag 'thunderbolt-for-v6.8-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt:
  thunderbolt: Fix NULL pointer dereference in tb_port_update_credits()

Author: gregkh

drivers/thunderbolt/switch.c

@@ -1249,6 +1249,9 @@ int tb_port_update_credits(struct tb_port *port)
 	ret = tb_port_do_update_credits(port);
 	if (ret)
 		return ret;
+
+	if (!port->dual_link_port)
+		return 0;
 	return tb_port_do_update_credits(port->dual_link_port);
 }