drm/mediatek: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.

Trivially convert the mediatek drm drivers from always returning zero in
the remove callback to the void returning variant.

Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jyri Sarha <jyri.sarha@iki.fi>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20230801110239.831099-8-u.kleine-koenig@pengutronix.de/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

14 files changed, 28 insertions, 53 deletions

diff --git a/drivers/gpu/drm/mediatek/mtk_cec.c b/drivers/gpu/drm/mediatek/mtk_cec.c
index b640bc0559e7..f47f417d8ba6 100644
--- a/drivers/gpu/drm/mediatek/mtk_cec.c
+++ b/drivers/gpu/drm/mediatek/mtk_cec.c
@@ -235,13 +235,12 @@ static int mtk_cec_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int mtk_cec_remove(struct platform_device *pdev)
+static void mtk_cec_remove(struct platform_device *pdev)
 {
 	struct mtk_cec *cec = platform_get_drvdata(pdev);
 
 	mtk_cec_htplg_irq_disable(cec);
 	clk_disable_unprepare(cec->clk);
-	return 0;
 }
 
 static const struct of_device_id mtk_cec_of_ids[] = {
@@ -252,7 +251,7 @@ MODULE_DEVICE_TABLE(of, mtk_cec_of_ids);
 
 struct platform_driver mtk_cec_driver = {
 	.probe = mtk_cec_probe,
-	.remove = mtk_cec_remove,
+	.remove_new = mtk_cec_remove,
 	.driver = {
 		.name = "mediatek-cec",
 		.of_match_table = mtk_cec_of_ids,
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_aal.c b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
index 434e8a9ce8ab..cbd9b4becc43 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_aal.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
@@ -140,11 +140,9 @@ static int mtk_disp_aal_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int mtk_disp_aal_remove(struct platform_device *pdev)
+static void mtk_disp_aal_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &mtk_disp_aal_component_ops);
-
-	return 0;
 }
 
 static const struct mtk_disp_aal_data mt8173_aal_driver_data = {
@@ -161,7 +159,7 @@ MODULE_DEVICE_TABLE(of, mtk_disp_aal_driver_dt_match);
 
 struct platform_driver mtk_disp_aal_driver = {
 	.probe		= mtk_disp_aal_probe,
-	.remove		= mtk_disp_aal_remove,
+	.remove_new	= mtk_disp_aal_remove,
 	.driver		= {
 		.name	= "mediatek-disp-aal",
 		.owner	= THIS_MODULE,
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c b/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c
index 1773379b2439..fa6dbc4e9c35 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c
@@ -195,11 +195,9 @@ static int mtk_disp_ccorr_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int mtk_disp_ccorr_remove(struct platform_device *pdev)
+static void mtk_disp_ccorr_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &mtk_disp_ccorr_component_ops);
-
-	return 0;
 }
 
 static const struct mtk_disp_ccorr_data mt8183_ccorr_driver_data = {
@@ -221,7 +219,7 @@ MODULE_DEVICE_TABLE(of, mtk_disp_ccorr_driver_dt_match);
 
 struct platform_driver mtk_disp_ccorr_driver = {
 	.probe		= mtk_disp_ccorr_probe,
-	.remove		= mtk_disp_ccorr_remove,
+	.remove_new	= mtk_disp_ccorr_remove,
 	.driver		= {
 		.name	= "mediatek-disp-ccorr",
 		.owner	= THIS_MODULE,
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_color.c b/drivers/gpu/drm/mediatek/mtk_disp_color.c
index cac9206079e7..78e44e6befd6 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_color.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_color.c
@@ -132,11 +132,9 @@ static int mtk_disp_color_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int mtk_disp_color_remove(struct platform_device *pdev)
+static void mtk_disp_color_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &mtk_disp_color_component_ops);
-
-	return 0;
 }
 
 static const struct mtk_disp_color_data mt2701_color_driver_data = {
@@ -164,7 +162,7 @@ MODULE_DEVICE_TABLE(of, mtk_disp_color_driver_dt_match);
 
 struct platform_driver mtk_disp_color_driver = {
 	.probe		= mtk_disp_color_probe,
-	.remove		= mtk_disp_color_remove,
+	.remove_new	= mtk_disp_color_remove,
 	.driver		= {
 		.name	= "mediatek-disp-color",
 		.owner	= THIS_MODULE,
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
index c844942603f7..c5237f4eb7fe 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
@@ -183,11 +183,9 @@ static int mtk_disp_gamma_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int mtk_disp_gamma_remove(struct platform_device *pdev)
+static void mtk_disp_gamma_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &mtk_disp_gamma_component_ops);
-
-	return 0;
 }
 
 static const struct mtk_disp_gamma_data mt8173_gamma_driver_data = {
@@ -209,7 +207,7 @@ MODULE_DEVICE_TABLE(of, mtk_disp_gamma_driver_dt_match);
 
 struct platform_driver mtk_disp_gamma_driver = {
 	.probe		= mtk_disp_gamma_probe,
-	.remove		= mtk_disp_gamma_remove,
+	.remove_new	= mtk_disp_gamma_remove,
 	.driver		= {
 		.name	= "mediatek-disp-gamma",
 		.owner	= THIS_MODULE,
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_merge.c b/drivers/gpu/drm/mediatek/mtk_disp_merge.c
index 6428b6203ffe..fd14a59bc951 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_merge.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_merge.c
@@ -295,11 +295,9 @@ static int mtk_disp_merge_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int mtk_disp_merge_remove(struct platform_device *pdev)
+static void mtk_disp_merge_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &mtk_disp_merge_component_ops);
-
-	return 0;
 }
 
 static const struct of_device_id mtk_disp_merge_driver_dt_match[] = {
@@ -311,7 +309,7 @@ MODULE_DEVICE_TABLE(of, mtk_disp_merge_driver_dt_match);
 
 struct platform_driver mtk_disp_merge_driver = {
 	.probe = mtk_disp_merge_probe,
-	.remove = mtk_disp_merge_remove,
+	.remove_new = mtk_disp_merge_remove,
 	.driver = {
 		.name = "mediatek-disp-merge",
 		.owner = THIS_MODULE,
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index 8f52cc1f3fba..5aaf4342cdbd 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -562,12 +562,10 @@ static int mtk_disp_ovl_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int mtk_disp_ovl_remove(struct platform_device *pdev)
+static void mtk_disp_ovl_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &mtk_disp_ovl_component_ops);
 	pm_runtime_disable(&pdev->dev);
-
-	return 0;
 }
 
 static const struct mtk_disp_ovl_data mt2701_ovl_driver_data = {
@@ -659,7 +657,7 @@ MODULE_DEVICE_TABLE(of, mtk_disp_ovl_driver_dt_match);
 
 struct platform_driver mtk_disp_ovl_driver = {
 	.probe		= mtk_disp_ovl_probe,
-	.remove		= mtk_disp_ovl_remove,
+	.remove_new	= mtk_disp_ovl_remove,
 	.driver		= {
 		.name	= "mediatek-disp-ovl",
 		.owner	= THIS_MODULE,
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
index d4df17ad600a..f0d851b53dff 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
@@ -380,13 +380,11 @@ static int mtk_disp_rdma_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int mtk_disp_rdma_remove(struct platform_device *pdev)
+static void mtk_disp_rdma_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &mtk_disp_rdma_component_ops);
 
 	pm_runtime_disable(&pdev->dev);
-
-	return 0;
 }
 
 static const struct mtk_disp_rdma_data mt2701_rdma_driver_data = {
@@ -428,7 +426,7 @@ MODULE_DEVICE_TABLE(of, mtk_disp_rdma_driver_dt_match);
 
 struct platform_driver mtk_disp_rdma_driver = {
 	.probe		= mtk_disp_rdma_probe,
-	.remove		= mtk_disp_rdma_remove,
+	.remove_new	= mtk_disp_rdma_remove,
 	.driver		= {
 		.name	= "mediatek-disp-rdma",
 		.owner	= THIS_MODULE,
diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index c06fcc7318e7..2cb47f663756 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -2694,7 +2694,7 @@ static int mtk_dp_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int mtk_dp_remove(struct platform_device *pdev)
+static void mtk_dp_remove(struct platform_device *pdev)
 {
 	struct mtk_dp *mtk_dp = platform_get_drvdata(pdev);
 
@@ -2705,8 +2705,6 @@ static int mtk_dp_remove(struct platform_device *pdev)
 	platform_device_unregister(mtk_dp->phy_dev);
 	if (mtk_dp->audio_pdev)
 		platform_device_unregister(mtk_dp->audio_pdev);
-
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -2767,7 +2765,7 @@ MODULE_DEVICE_TABLE(of, mtk_dp_of_match);
 
 static struct platform_driver mtk_dp_driver = {
 	.probe = mtk_dp_probe,
-	.remove = mtk_dp_remove,
+	.remove_new = mtk_dp_remove,
 	.driver = {
 		.name = "mediatek-drm-dp",
 		.of_match_table = mtk_dp_of_match,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 6dcb4ba2466c..c77d5c73835d 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -909,7 +909,7 @@ err_node:
 	return ret;
 }
 
-static int mtk_drm_remove(struct platform_device *pdev)
+static void mtk_drm_remove(struct platform_device *pdev)
 {
 	struct mtk_drm_private *private = platform_get_drvdata(pdev);
 	int i;
@@ -919,8 +919,6 @@ static int mtk_drm_remove(struct platform_device *pdev)
 	of_node_put(private->mutex_node);
 	for (i = 0; i < DDP_COMPONENT_DRM_ID_MAX; i++)
 		of_node_put(private->comp_node[i]);
-
-	return 0;
 }
 
 static int mtk_drm_sys_prepare(struct device *dev)
@@ -953,7 +951,7 @@ static const struct dev_pm_ops mtk_drm_pm_ops = {
 
 static struct platform_driver mtk_drm_platform_driver = {
 	.probe	= mtk_drm_probe,
-	.remove	= mtk_drm_remove,
+	.remove_new = mtk_drm_remove,
 	.driver	= {
 		.name	= "mediatek-drm",
 		.pm     = &mtk_drm_pm_ops,
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 7d5250351193..d8bfc2cce54d 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -1178,14 +1178,12 @@ err_unregister_host:
 	return ret;
 }
 
-static int mtk_dsi_remove(struct platform_device *pdev)
+static void mtk_dsi_remove(struct platform_device *pdev)
 {
 	struct mtk_dsi *dsi = platform_get_drvdata(pdev);
 
 	mtk_output_dsi_disable(dsi);
 	mipi_dsi_host_unregister(&dsi->host);
-
-	return 0;
 }
 
 static const struct mtk_dsi_driver_data mt8173_dsi_driver_data = {
@@ -1223,7 +1221,7 @@ MODULE_DEVICE_TABLE(of, mtk_dsi_of_match);
 
 struct platform_driver mtk_dsi_driver = {
 	.probe = mtk_dsi_probe,
-	.remove = mtk_dsi_remove,
+	.remove_new = mtk_dsi_remove,
 	.driver = {
 		.name = "mtk-dsi",
 		.of_match_table = mtk_dsi_of_match,
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 0a8e0a13f516..86133bf16326 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1746,13 +1746,12 @@ err_bridge_remove:
 	return ret;
 }
 
-static int mtk_drm_hdmi_remove(struct platform_device *pdev)
+static void mtk_drm_hdmi_remove(struct platform_device *pdev)
 {
 	struct mtk_hdmi *hdmi = platform_get_drvdata(pdev);
 
 	drm_bridge_remove(&hdmi->bridge);
 	mtk_hdmi_clk_disable_audio(hdmi);
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -1806,7 +1805,7 @@ MODULE_DEVICE_TABLE(of, mtk_drm_hdmi_of_ids);
 
 static struct platform_driver mtk_hdmi_driver = {
 	.probe = mtk_drm_hdmi_probe,
-	.remove = mtk_drm_hdmi_remove,
+	.remove_new = mtk_drm_hdmi_remove,
 	.driver = {
 		.name = "mediatek-drm-hdmi",
 		.of_match_table = mtk_drm_hdmi_of_ids,
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_ddc.c b/drivers/gpu/drm/mediatek/mtk_hdmi_ddc.c
index 4d39ea0a05ca..d675c954befe 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi_ddc.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi_ddc.c
@@ -324,14 +324,12 @@ err_clk_disable:
 	return ret;
 }
 
-static int mtk_hdmi_ddc_remove(struct platform_device *pdev)
+static void mtk_hdmi_ddc_remove(struct platform_device *pdev)
 {
 	struct mtk_hdmi_ddc *ddc = platform_get_drvdata(pdev);
 
 	i2c_del_adapter(&ddc->adap);
 	clk_disable_unprepare(ddc->clk);
-
-	return 0;
 }
 
 static const struct of_device_id mtk_hdmi_ddc_match[] = {
@@ -342,7 +340,7 @@ MODULE_DEVICE_TABLE(of, mtk_hdmi_ddc_match);
 
 struct platform_driver mtk_hdmi_ddc_driver = {
 	.probe = mtk_hdmi_ddc_probe,
-	.remove = mtk_hdmi_ddc_remove,
+	.remove_new = mtk_hdmi_ddc_remove,
 	.driver = {
 		.name = "mediatek-hdmi-ddc",
 		.of_match_table = mtk_hdmi_ddc_match,
diff --git a/drivers/gpu/drm/mediatek/mtk_mdp_rdma.c b/drivers/gpu/drm/mediatek/mtk_mdp_rdma.c
index e06db6e56b5f..5746f06220c1 100644
--- a/drivers/gpu/drm/mediatek/mtk_mdp_rdma.c
+++ b/drivers/gpu/drm/mediatek/mtk_mdp_rdma.c
@@ -315,11 +315,10 @@ static int mtk_mdp_rdma_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int mtk_mdp_rdma_remove(struct platform_device *pdev)
+static void mtk_mdp_rdma_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &mtk_mdp_rdma_component_ops);
 	pm_runtime_disable(&pdev->dev);
-	return 0;
 }
 
 static const struct of_device_id mtk_mdp_rdma_driver_dt_match[] = {
@@ -330,7 +329,7 @@ MODULE_DEVICE_TABLE(of, mtk_mdp_rdma_driver_dt_match);
 
 struct platform_driver mtk_mdp_rdma_driver = {
 	.probe = mtk_mdp_rdma_probe,
-	.remove = mtk_mdp_rdma_remove,
+	.remove_new = mtk_mdp_rdma_remove,
 	.driver = {
 		.name = "mediatek-mdp-rdma",
 		.owner = THIS_MODULE,