[PATCH 1/8] drm/atmel-hlcdc: use managed device resources for the display controller

[Ludovic Desroches <ludovic.desroches@microchip.com>]

Take benefit of managed device resources to reduce the risk of memory
leak and to simplify error paths.

Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Reviewed-by: Manikandan Muralidharan <manikandan.m@microchip.com>
---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 25 ++++++++++++-------------
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h |  1 +
 2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
index dd70894c8f38e7303e06167594ac289cb345b510..8ed029381c555db10d596efc8d52753c47767633 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
@@ -751,11 +751,16 @@ static int atmel_hlcdc_dc_modeset_init(struct drm_device *dev)
 	return 0;
 }
 
+static struct atmel_hlcdc_dc *atmel_hlcdc_dc_of_dev(struct drm_device *dev)
+{
+	return container_of(dev, struct atmel_hlcdc_dc, dev);
+}
+
 static int atmel_hlcdc_dc_load(struct drm_device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev->dev);
 	const struct of_device_id *match;
-	struct atmel_hlcdc_dc *dc;
+	struct atmel_hlcdc_dc *dc = atmel_hlcdc_dc_of_dev(dev);
 	int ret;
 
 	match = of_match_node(atmel_hlcdc_of_match, dev->dev->parent->of_node);
@@ -769,10 +774,6 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev)
 		return -EINVAL;
 	}
 
-	dc = devm_kzalloc(dev->dev, sizeof(*dc), GFP_KERNEL);
-	if (!dc)
-		return -ENOMEM;
-
 	dc->desc = match->data;
 	dc->hlcdc = dev_get_drvdata(dev->dev->parent);
 	dev->dev_private = dc;
@@ -853,16 +854,18 @@ static const struct drm_driver atmel_hlcdc_dc_driver = {
 
 static int atmel_hlcdc_dc_drm_probe(struct platform_device *pdev)
 {
+	struct atmel_hlcdc_dc *dc;
 	struct drm_device *ddev;
 	int ret;
 
-	ddev = drm_dev_alloc(&atmel_hlcdc_dc_driver, &pdev->dev);
-	if (IS_ERR(ddev))
-		return PTR_ERR(ddev);
+	dc = devm_drm_dev_alloc(&pdev->dev, &atmel_hlcdc_dc_driver, struct atmel_hlcdc_dc, dev);
+	if (IS_ERR(dc))
+		return PTR_ERR(dc);
+	ddev = &dc->dev;
 
 	ret = atmel_hlcdc_dc_load(ddev);
 	if (ret)
-		goto err_put;
+		return ret;
 
 	ret = drm_dev_register(ddev, 0);
 	if (ret)
@@ -875,9 +878,6 @@ static int atmel_hlcdc_dc_drm_probe(struct platform_device *pdev)
 err_unload:
 	atmel_hlcdc_dc_unload(ddev);
 
-err_put:
-	drm_dev_put(ddev);
-
 	return ret;
 }
 
@@ -887,7 +887,6 @@ static void atmel_hlcdc_dc_drm_remove(struct platform_device *pdev)
 
 	drm_dev_unregister(ddev);
 	atmel_hlcdc_dc_unload(ddev);
-	drm_dev_put(ddev);
 }
 
 static void atmel_hlcdc_dc_drm_shutdown(struct platform_device *pdev)
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
index 53d47f01db0bd4d906b73f9f2a46f2ef7326d8c6..26b26185cf34ac1678f385982caabd2dbbc22630 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
@@ -350,6 +350,7 @@ struct atmel_hlcdc_dc {
 	struct dma_pool *dscrpool;
 	struct atmel_hlcdc *hlcdc;
 	struct drm_crtc *crtc;
+	struct drm_device dev;
 	struct atmel_hlcdc_layer *layers[ATMEL_HLCDC_MAX_LAYERS];
 	struct {
 		u32 imr;

-- 
2.51.0