[PATCH 5/5] drm/mediatek: ovl_adaptor: fix probe device leaks

[Johan Hovold <johan@kernel.org>]

Make sure to drop the references taken to the component devices by
of_find_device_by_node() during probe on probe failure (e.g. probe
deferral) and on driver unbind.

Fixes: 453c3364632a ("drm/mediatek: Add ovl_adaptor support for MT8195")
Cc: stable@vger.kernel.org	# 6.4
Cc: Nancy.Lin <nancy.lin@mediatek.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
index fe97bb97e004..c0af3e3b51d5 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
@@ -527,6 +527,13 @@ bool mtk_ovl_adaptor_is_comp_present(struct device_node *node)
 	       type == OVL_ADAPTOR_TYPE_PADDING;
 }
 
+static void ovl_adaptor_put_device(void *_dev)
+{
+	struct device *dev = _dev;
+
+	put_device(dev);
+}
+
 static int ovl_adaptor_comp_init(struct device *dev, struct component_match **match)
 {
 	struct mtk_disp_ovl_adaptor *priv = dev_get_drvdata(dev);
@@ -560,6 +567,11 @@ static int ovl_adaptor_comp_init(struct device *dev, struct component_match **ma
 		if (!comp_pdev)
 			return -EPROBE_DEFER;
 
+		ret = devm_add_action_or_reset(dev, ovl_adaptor_put_device,
+					       &comp_pdev->dev);
+		if (ret)
+			return ret;
+
 		priv->ovl_adaptor_comp[id] = &comp_pdev->dev;
 
 		drm_of_component_match_add(dev, match, component_compare_of, node);
-- 
2.49.1