[PATCH AUTOSEL 4.9 09/24] drm/bridge/analogix/anx78xx: Cleanup on error in anx78xx_bridge_attach()

[Sasha Levin]

From: Lyude Paul <lyude@xxxxxxxxxx>

[ Upstream commit 212ee8db84600f7b279b8645c62a112bff310995 ]

Just another issue I noticed while correcting usages of
drm_dp_aux_init()/drm_dp_aux_register() around the tree. If any of the
steps in anx78xx_bridge_attach() fail, we end up leaking resources. So,
let's fix that (and fix leaking a DP AUX adapter in the process) by
unrolling on errors.

Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Reviewed-by: Robert Foss <robert.foss@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20210219215326.2227596-10-lyude@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/bridge/analogix-anx78xx.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix-anx78xx.c b/drivers/gpu/drm/bridge/analogix-anx78xx.c
index 16babacb7cf0..5a1121af6664 100644
--- a/drivers/gpu/drm/bridge/analogix-anx78xx.c
+++ b/drivers/gpu/drm/bridge/analogix-anx78xx.c
@@ -1039,7 +1039,7 @@ static int anx78xx_bridge_attach(struct drm_bridge *bridge)
 				 DRM_MODE_CONNECTOR_DisplayPort);
 	if (err) {
 		DRM_ERROR("Failed to initialize connector: %d\n", err);
-		return err;
+		goto aux_unregister;
 	}
 
 	drm_connector_helper_add(&anx78xx->connector,
@@ -1051,16 +1051,21 @@ static int anx78xx_bridge_attach(struct drm_bridge *bridge)
 						bridge->encoder);
 	if (err) {
 		DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
-		return err;
+		goto connector_cleanup;
 	}
 
 	err = drm_connector_register(&anx78xx->connector);
 	if (err) {
 		DRM_ERROR("Failed to register connector: %d\n", err);
-		return err;
+		goto connector_cleanup;
 	}
 
 	return 0;
+connector_cleanup:
+	drm_connector_cleanup(&anx78xx->connector);
+aux_unregister:
+	drm_dp_aux_unregister(&anx78xx->aux);
+	return err;
 }
 
 static bool anx78xx_bridge_mode_fixup(struct drm_bridge *bridge,
-- 
2.30.2