[PATCH 7.1 388/438] drm/mediatek: mtk_hdmi: Fix DDC adapter double put in v2

7.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guangshuo Li <[email protected]>

commit d19d8542808c3be5f4af849da6509e877b74d811 upstream.

mtk_hdmi_common_probe() gets the DDC adapter with
of_find_i2c_adapter_by_node() and registers a devm action to release the
adapter device reference with put_device().

The HDMI v2 remove callback also calls i2c_put_adapter() on the same DDC
adapter. This is not paired with of_find_i2c_adapter_by_node(): it drops
the adapter device reference before the devm action drops it again, and
it also puts a module reference that was never taken.

Remove the extra i2c_put_adapter() call and drop the now-empty HDMI v2
remove callback. The common devm action releases the adapter device
reference.

Fixes: 8d0f79886273 ("drm/mediatek: Introduce HDMI/DDC v2 for MT8195/MT8188")
Cc: [email protected]
Reviewed-by: Johan Hovold <[email protected]>
Signed-off-by: Guangshuo Li <[email protected]>
Reviewed-by: CK Hu <[email protected]>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/[email protected]/
Signed-off-by: Chun-Kuang Hu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 drivers/gpu/drm/mediatek/mtk_hdmi_v2.c |    8 --------
 1 file changed, 8 deletions(-)

--- a/drivers/gpu/drm/mediatek/mtk_hdmi_v2.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi_v2.c
@@ -1499,13 +1499,6 @@ static int mtk_hdmi_v2_probe(struct plat
 	return 0;
 }
 
-static void mtk_hdmi_v2_remove(struct platform_device *pdev)
-{
-	struct mtk_hdmi *hdmi = platform_get_drvdata(pdev);
-
-	i2c_put_adapter(hdmi->ddc_adpt);
-}
-
 static const struct of_device_id mtk_drm_hdmi_v2_of_ids[] = {
 	{ .compatible = "mediatek,mt8188-hdmi-tx", .data = &mtk_hdmi_conf_mt8188 },
 	{ .compatible = "mediatek,mt8195-hdmi-tx", .data = &mtk_hdmi_conf_mt8195 },
@@ -1515,7 +1508,6 @@ MODULE_DEVICE_TABLE(of, mtk_drm_hdmi_v2_
 
 static struct platform_driver mtk_hdmi_v2_driver = {
 	.probe = mtk_hdmi_v2_probe,
-	.remove = mtk_hdmi_v2_remove,
 	.driver = {
 		.name = "mediatek-drm-hdmi-v2",
 		.of_match_table = mtk_drm_hdmi_v2_of_ids,