[PATCH 3/8] thunderbolt: Fix lane bonding log when bonding not possible

[Mika Westerberg <mika.westerberg@linux.intel.com>]

From: Gil Fine <gil.fine@linux.intel.com>

Currently if lane bonding is not possible or not supported, we continue
and read the updated number of Total Buffers from lane adapters unnecessarily
and incorrectly log the bonding as successful.

Fix this by bailing out early when bonding is not possible, avoiding
the unnecessary read and the misleading log message.

Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
 drivers/thunderbolt/switch.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index ad0ec8f8ee28..f421997c298d 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -2977,14 +2977,14 @@ static int tb_switch_lane_bonding_enable(struct tb_switch *sw)
 	int ret;
 
 	if (!tb_switch_lane_bonding_possible(sw))
-		return 0;
+		return -EOPNOTSUPP;
 
 	up = tb_upstream_port(sw);
 	down = tb_switch_downstream_port(sw);
 
 	if (!tb_port_width_supported(up, TB_LINK_WIDTH_DUAL) ||
 	    !tb_port_width_supported(down, TB_LINK_WIDTH_DUAL))
-		return 0;
+		return -EOPNOTSUPP;
 
 	/*
 	 * Both lanes need to be in CL0. Here we assume lane 0 already be in
-- 
2.50.1