[PATCH v6 4/8] drm: writeback: Introduce cleanup function

[Louis Chauvet]

Currently there is no cleanup function for writeback connectors. To allows
implementation of drmm variant of writeback connector, create a cleanup
function that can be used to properly remove all the writeback-specific
properties and allocations.

This also introduce an helper to cleanup only the drm_writeback_connector
properties, so it can be used during initialization to cleanup in case of
failure.

Signed-off-by: Louis Chauvet <louis.chauvet at bootlin.com>
---
 drivers/gpu/drm/drm_writeback.c | 43 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/drm_writeback.c b/drivers/gpu/drm/drm_writeback.c
index 33a3c98a962d1ec49ac4b353902036cf74290ae6..c274cba257cde5f4b446df3854974e690c60bf7b 100644
--- a/drivers/gpu/drm/drm_writeback.c
+++ b/drivers/gpu/drm/drm_writeback.c
@@ -15,6 +15,7 @@
 #include <drm/drm_device.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_framebuffer.h>
+#include <drm/drm_managed.h>
 #include <drm/drm_modeset_helper_vtables.h>
 #include <drm/drm_property.h>
 #include <drm/drm_writeback.h>
@@ -140,6 +141,22 @@ static int create_writeback_properties(struct drm_device *dev)
 	return 0;
 }
 
+static void delete_writeback_properties(struct drm_device *dev)
+{
+	if (dev->mode_config.writeback_pixel_formats_property) {
+		drm_property_destroy(dev, dev->mode_config.writeback_pixel_formats_property);
+		dev->mode_config.writeback_pixel_formats_property = NULL;
+	}
+	if (dev->mode_config.writeback_out_fence_ptr_property) {
+		drm_property_destroy(dev, dev->mode_config.writeback_out_fence_ptr_property);
+		dev->mode_config.writeback_out_fence_ptr_property = NULL;
+	}
+	if (dev->mode_config.writeback_fb_id_property) {
+		drm_property_destroy(dev, dev->mode_config.writeback_fb_id_property);
+		dev->mode_config.writeback_fb_id_property = NULL;
+	}
+}
+
 static const struct drm_encoder_funcs drm_writeback_encoder_funcs = {
 	.destroy = drm_encoder_cleanup,
 };
@@ -284,6 +301,32 @@ int drm_writeback_connector_init_with_encoder(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_writeback_connector_init_with_encoder);
 
+/**
+ * drm_writeback_connector_cleanup - Cleanup the writeback connector
+ * @dev: DRM device
+ * @wb_connector: Pointer to the writeback connector to clean up
+ *
+ * This will decrement the reference counter of blobs and destroy properties. It
+ * will also clean the remaining jobs in this writeback connector. Caution: This helper will not
+ * clean up the attached encoder and the drm_connector.
+ */
+static void drm_writeback_connector_cleanup(struct drm_device *dev,
+					    struct drm_writeback_connector *wb_connector)
+{
+	unsigned long flags;
+	struct drm_writeback_job *pos, *n;
+
+	delete_writeback_properties(dev);
+	drm_property_blob_put(wb_connector->pixel_formats_blob_ptr);
+
+	spin_lock_irqsave(&wb_connector->job_lock, flags);
+	list_for_each_entry_safe(pos, n, &wb_connector->job_queue, list_entry) {
+		drm_writeback_cleanup_job(pos);
+		list_del(&pos->list_entry);
+	}
+	spin_unlock_irqrestore(&wb_connector->job_lock, flags);
+}
+
 int drm_writeback_set_fb(struct drm_connector_state *conn_state,
 			 struct drm_framebuffer *fb)
 {

-- 
2.47.1