[PATCH 02/13] drm/exynos: separated subdrv->probe call and encoder/connector creation.

[Inki Dae]

this patch separates sub driver's probe call and encoder/connector creation
so that exynos drm core module can take exception when some operation was
failed properly.

Signed-off-by: Inki Dae <inki.dae at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_core.c |   93 +++++++++++++++++++++---------
 1 files changed, 65 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_core.c b/drivers/gpu/drm/exynos/exynos_drm_core.c
index 84dd099..1c8d5fe 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_core.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_core.c
@@ -34,30 +34,15 @@
 
 static LIST_HEAD(exynos_drm_subdrv_list);
 
-static int exynos_drm_subdrv_probe(struct drm_device *dev,
+static int exynos_drm_create_enc_conn(struct drm_device *dev,
 					struct exynos_drm_subdrv *subdrv)
 {
 	struct drm_encoder *encoder;
 	struct drm_connector *connector;
+	int ret;
 
 	DRM_DEBUG_DRIVER("%s\n", __FILE__);
 
-	if (subdrv->probe) {
-		int ret;
-
-		/*
-		 * this probe callback would be called by sub driver
-		 * after setting of all resources to this sub driver,
-		 * such as clock, irq and register map are done or by load()
-		 * of exynos drm driver.
-		 *
-		 * P.S. note that this driver is considered for modularization.
-		 */
-		ret = subdrv->probe(dev, subdrv->dev);
-		if (ret)
-			return ret;
-	}
-
 	if (!subdrv->manager)
 		return 0;
 
@@ -78,24 +63,22 @@ static int exynos_drm_subdrv_probe(struct drm_device *dev,
 	connector = exynos_drm_connector_create(dev, encoder);
 	if (!connector) {
 		DRM_ERROR("failed to create connector\n");
-		encoder->funcs->destroy(encoder);
-		return -EFAULT;
+		ret = -EFAULT;
+		goto err_destroy_encoder;
 	}
 
 	subdrv->encoder = encoder;
 	subdrv->connector = connector;
 
 	return 0;
+
+err_destroy_encoder:
+	encoder->funcs->destroy(encoder);
+	return ret;
 }
 
-static void exynos_drm_subdrv_remove(struct drm_device *dev,
-				      struct exynos_drm_subdrv *subdrv)
+static void exynos_drm_destroy_enc_conn(struct exynos_drm_subdrv *subdrv)
 {
-	DRM_DEBUG_DRIVER("%s\n", __FILE__);
-
-	if (subdrv->remove)
-		subdrv->remove(dev);
-
 	if (subdrv->encoder) {
 		struct drm_encoder *encoder = subdrv->encoder;
 		encoder->funcs->destroy(encoder);
@@ -109,9 +92,48 @@ static void exynos_drm_subdrv_remove(struct drm_device *dev,
 	}
 }
 
+static int exynos_drm_subdrv_probe(struct drm_device *dev,
+					struct exynos_drm_subdrv *subdrv)
+{
+	if (subdrv->probe) {
+		int ret;
+
+		subdrv->drm_dev = dev;
+
+		/*
+		 * this probe callback would be called by sub driver
+		 * after setting of all resources to this sub driver,
+		 * such as clock, irq and register map are done or by load()
+		 * of exynos drm driver.
+		 *
+		 * P.S. note that this driver is considered for modularization.
+		 */
+		ret = subdrv->probe(dev, subdrv->dev);
+		if (ret)
+			return ret;
+	}
+
+	if (!subdrv->manager)
+		return -EINVAL;
+
+	subdrv->manager->dev = subdrv->dev;
+
+	return 0;
+}
+
+static void exynos_drm_subdrv_remove(struct drm_device *dev,
+				      struct exynos_drm_subdrv *subdrv)
+{
+	DRM_DEBUG_DRIVER("%s\n", __FILE__);
+
+	if (subdrv->remove)
+		subdrv->remove(dev, subdrv->dev);
+}
+
 int exynos_drm_device_register(struct drm_device *dev)
 {
 	struct exynos_drm_subdrv *subdrv, *n;
+	unsigned int fine_cnt = 0;
 	int err;
 
 	DRM_DEBUG_DRIVER("%s\n", __FILE__);
@@ -120,14 +142,27 @@ int exynos_drm_device_register(struct drm_device *dev)
 		return -EINVAL;
 
 	list_for_each_entry_safe(subdrv, n, &exynos_drm_subdrv_list, list) {
-		subdrv->drm_dev = dev;
 		err = exynos_drm_subdrv_probe(dev, subdrv);
 		if (err) {
 			DRM_DEBUG("exynos drm subdrv probe failed.\n");
 			list_del(&subdrv->list);
+			continue;
 		}
+
+		err = exynos_drm_create_enc_conn(dev, subdrv);
+		if (err) {
+			DRM_DEBUG("failed to create encoder and connector.\n");
+			exynos_drm_subdrv_remove(dev, subdrv);
+			list_del(&subdrv->list);
+			continue;
+		}
+
+		fine_cnt++;
 	}
 
+	if (!fine_cnt)
+		return -EINVAL;
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(exynos_drm_device_register);
@@ -143,8 +178,10 @@ int exynos_drm_device_unregister(struct drm_device *dev)
 		return -EINVAL;
 	}
 
-	list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list)
+	list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
 		exynos_drm_subdrv_remove(dev, subdrv);
+		exynos_drm_destroy_enc_conn(subdrv);
+	}
 
 	return 0;
 }
-- 
1.7.4.1