[PATCH v2 4/9] drm/fb-helper: Push down modeset lock into FB helpers

[Thierry Reding]

From: Thierry Reding <treding at nvidia.com>

Move the modeset locking from drivers into FB helpers.

Signed-off-by: Thierry Reding <treding at nvidia.com>
---
 drivers/gpu/drm/drm_fb_helper.c        | 59 +++++++++++++++++++++++++---------
 drivers/gpu/drm/i915/intel_dp_mst.c    |  4 ---
 drivers/gpu/drm/radeon/radeon_dp_mst.c |  7 ----
 3 files changed, 44 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 9afd4208596f..252c7557bdb5 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -95,8 +95,8 @@ static LIST_HEAD(kernel_fb_helper_list);
  * mmap page writes.
  */
 
-int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
-				    struct drm_connector *connector)
+static int __drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
+					     struct drm_connector *connector)
 {
 	struct drm_fb_helper_connector **temp;
 	struct drm_fb_helper_connector *conn;
@@ -129,6 +129,20 @@ int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
 	fb_helper->connector_info[fb_helper->connector_count++] = conn;
 	return 0;
 }
+
+int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
+				    struct drm_connector *connector)
+{
+	int err;
+
+	mutex_lock(&fb_helper->dev->mode_config.mutex);
+
+	err = __drm_fb_helper_add_one_connector(fb_helper, connector);
+
+	mutex_unlock(&fb_helper->dev->mode_config.mutex);
+
+	return err;
+}
 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
 
 /**
@@ -155,28 +169,28 @@ int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 		return 0;
 
 	mutex_lock(&dev->mode_config.mutex);
+
 	drm_for_each_connector(connector, dev) {
-		ret = drm_fb_helper_add_one_connector(fb_helper, connector);
+		ret = __drm_fb_helper_add_one_connector(fb_helper, connector);
+		if (ret) {
+			for (i = 0; i < fb_helper->connector_count; i++) {
+				kfree(fb_helper->connector_info[i]);
+				fb_helper->connector_info[i] = NULL;
+			}
 
-		if (ret)
-			goto fail;
-	}
-	mutex_unlock(&dev->mode_config.mutex);
-	return 0;
-fail:
-	for (i = 0; i < fb_helper->connector_count; i++) {
-		kfree(fb_helper->connector_info[i]);
-		fb_helper->connector_info[i] = NULL;
+			fb_helper->connector_count = 0;
+			break;
+		}
 	}
-	fb_helper->connector_count = 0;
+
 	mutex_unlock(&dev->mode_config.mutex);
 
 	return ret;
 }
 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 
-int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
-				       struct drm_connector *connector)
+static int __drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
+						struct drm_connector *connector)
 {
 	struct drm_fb_helper_connector *fb_helper_connector;
 	int i, j;
@@ -193,6 +207,7 @@ int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 
 	if (i == fb_helper->connector_count)
 		return -EINVAL;
+
 	fb_helper_connector = fb_helper->connector_info[i];
 	drm_connector_unreference(fb_helper_connector->connector);
 
@@ -204,6 +219,20 @@ int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 
 	return 0;
 }
+
+int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
+				       struct drm_connector *connector)
+{
+	int err;
+
+	mutex_lock(&fb_helper->dev->mode_config.mutex);
+
+	err = __drm_fb_helper_remove_one_connector(fb_helper, connector);
+
+	mutex_unlock(&fb_helper->dev->mode_config.mutex);
+
+	return err;
+}
 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
 
 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 7a34090cef34..47c3980cb3b9 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -477,9 +477,7 @@ static void intel_dp_register_mst_connector(struct drm_connector *connector)
 {
 	struct intel_connector *intel_connector = to_intel_connector(connector);
 	struct drm_device *dev = connector->dev;
-	drm_modeset_lock_all(dev);
 	intel_connector_add_to_fbdev(intel_connector);
-	drm_modeset_unlock_all(dev);
 	drm_connector_register(&intel_connector->base);
 }
 
@@ -492,10 +490,8 @@ static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 	intel_connector->unregister(intel_connector);
 
 	/* need to nuke the connector */
-	drm_modeset_lock_all(dev);
 	intel_connector_remove_from_fbdev(intel_connector);
 	intel_connector->mst_port = NULL;
-	drm_modeset_unlock_all(dev);
 
 	drm_connector_unreference(&intel_connector->base);
 	DRM_DEBUG_KMS("\n");
diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c
index de504ea29c06..a4ccaa5af104 100644
--- a/drivers/gpu/drm/radeon/radeon_dp_mst.c
+++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c
@@ -299,9 +299,7 @@ static void radeon_dp_register_mst_connector(struct drm_connector *connector)
 	struct drm_device *dev = connector->dev;
 	struct radeon_device *rdev = dev->dev_private;
 
-	drm_modeset_lock_all(dev);
 	radeon_fb_add_connector(rdev, connector);
-	drm_modeset_unlock_all(dev);
 
 	drm_connector_register(connector);
 }
@@ -314,13 +312,8 @@ static void radeon_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 	struct radeon_device *rdev = dev->dev_private;
 
 	drm_connector_unregister(connector);
-	/* need to nuke the connector */
-	drm_modeset_lock_all(dev);
-	/* dpms off */
 	radeon_fb_remove_connector(rdev, connector);
-
 	drm_connector_cleanup(connector);
-	drm_modeset_unlock_all(dev);
 
 	kfree(connector);
 	DRM_DEBUG_KMS("\n");
-- 
2.8.3