[PATCH v3 3/6] drm/etnaviv: add dedicate functions to create and destroy platform device

[Sui Jingfeng]

From: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>

 Also rename the virtual master device as etnaviv_platform_device, for
 better reflection that it is a platform device, not the drm device control
 structure. Another benefit is that we no longer need to call of_node_put()
 for three different case. Instead, we only need call it once.

Signed-off-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>
---
 drivers/gpu/drm/etnaviv/etnaviv_drv.c | 56 +++++++++++++++++++--------
 1 file changed, 39 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
index 44ca803237a5..ce0537af80bd 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
@@ -697,12 +697,44 @@ static struct platform_driver etnaviv_platform_driver = {
 	},
 };
 
-static struct platform_device *etnaviv_drm;
+static struct platform_device *etnaviv_platform_device;
 
-static int __init etnaviv_init(void)
+static int etnaviv_create_platform_device(const char *name,
+					  struct platform_device **ppdev)
 {
 	struct platform_device *pdev;
 	int ret;
+
+	pdev = platform_device_alloc(name, PLATFORM_DEVID_NONE);
+	if (!pdev)
+		return -ENOMEM;
+
+	ret = platform_device_add(pdev);
+	if (ret) {
+		platform_device_put(pdev);
+		return ret;
+	}
+
+	*ppdev = pdev;
+
+	return 0;
+}
+
+static void etnaviv_destroy_platform_device(struct platform_device **ppdev)
+{
+	struct platform_device *pdev = *ppdev;
+
+	if (!pdev)
+		return;
+
+	*ppdev = NULL;
+
+	platform_device_unregister(pdev);
+}
+
+static int __init etnaviv_init(void)
+{
+	int ret;
 	struct device_node *np;
 
 	etnaviv_validate_init();
@@ -723,22 +755,12 @@ static int __init etnaviv_init(void)
 		if (!of_device_is_available(np))
 			continue;
 
-		pdev = platform_device_alloc("etnaviv", PLATFORM_DEVID_NONE);
-		if (!pdev) {
-			ret = -ENOMEM;
-			of_node_put(np);
-			goto unregister_platform_driver;
-		}
-
-		ret = platform_device_add(pdev);
-		if (ret) {
-			platform_device_put(pdev);
-			of_node_put(np);
+		ret = etnaviv_create_platform_device("etnaviv",
+						     &etnaviv_platform_device);
+		of_node_put(np);
+		if (ret)
 			goto unregister_platform_driver;
-		}
 
-		etnaviv_drm = pdev;
-		of_node_put(np);
 		break;
 	}
 
@@ -754,7 +776,7 @@ module_init(etnaviv_init);
 
 static void __exit etnaviv_exit(void)
 {
-	platform_device_unregister(etnaviv_drm);
+	etnaviv_destroy_platform_device(&etnaviv_platform_device);
 	platform_driver_unregister(&etnaviv_platform_driver);
 	platform_driver_unregister(&etnaviv_gpu_driver);
 }
-- 
2.25.1