[PATCH] drm/meson: Fix next_bridge reference leak in meson_encoder_dsi_probe()

[Wentao Liang]

The reference on the next bridge returned by
of_drm_find_and_get_bridge() is never released when
drm_simple_encoder_init() or drm_bridge_attach() fails. Drop it on
both error paths before returning.

Fixes: bfb8f5d0a9e7 ("drm/meson: encoder_dsi: get/put the next bridge")
Signed-off-by: Wentao Liang <vulab at iscas.ac.cn>
---
 drivers/gpu/drm/meson/meson_encoder_dsi.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_encoder_dsi.c b/drivers/gpu/drm/meson/meson_encoder_dsi.c
index eba246791c68..5f2eeeaf93b8 100644
--- a/drivers/gpu/drm/meson/meson_encoder_dsi.c
+++ b/drivers/gpu/drm/meson/meson_encoder_dsi.c
@@ -135,17 +135,21 @@ int meson_encoder_dsi_probe(struct meson_drm *priv)
 	/* Encoder */
 	ret = drm_simple_encoder_init(priv->drm, &meson_encoder_dsi->encoder,
 				      DRM_MODE_ENCODER_DSI);
-	if (ret)
+	if (ret) {
+		drm_bridge_put(meson_encoder_dsi->bridge.next_bridge);
 		return dev_err_probe(priv->dev, ret,
 				     "Failed to init DSI encoder\n");
+	}
 
 	meson_encoder_dsi->encoder.possible_crtcs = BIT(0);
 
 	/* Attach DSI Encoder Bridge to Encoder */
 	ret = drm_bridge_attach(&meson_encoder_dsi->encoder, &meson_encoder_dsi->bridge, NULL, 0);
-	if (ret)
+	if (ret) {
+		drm_bridge_put(meson_encoder_dsi->bridge.next_bridge);
 		return dev_err_probe(priv->dev, ret,
 				     "Failed to attach bridge\n");
+	}
 
 	/*
 	 * We should have now in place:
-- 
2.34.1