[PATCH 4/8] drm/fb-helper: Allocate a drm_file

[Noralf Trønnes]

Allocate a drm_file so drivers can use drm_framebuffer_create_dumb()
to create a buffer. The framebuffer is reaped automtically in
drm_fb_helper_fini().

Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
---
 drivers/gpu/drm/drm_fb_helper.c | 22 ++++++++++++++++++++--
 include/drm/drm_fb_helper.h     |  9 +++++++++
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 6a31d13..a04bdf9 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -35,6 +35,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <drm/drmP.h>
+#include <drm/drm_auth.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>
@@ -902,6 +903,7 @@ EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
  *
  * This cleans up all remaining resources associated with @fb_helper. Must be
  * called after drm_fb_helper_unlink_fbi() was called.
+ * drm_framebuffer_create_dumb() created framebuffers will be destroyed.
  */
 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 {
@@ -932,6 +934,7 @@ void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 	mutex_destroy(&fb_helper->lock);
 	drm_fb_helper_crtc_free(fb_helper);
 
+	drm_file_free(fb_helper->file);
 }
 EXPORT_SYMBOL(drm_fb_helper_fini);
 
@@ -2465,6 +2468,16 @@ __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper,
 	unsigned int width, height;
 	int ret;
 
+	fb_helper->file = drm_file_alloc(dev->primary);
+	if (IS_ERR(fb_helper->file)) {
+		ret = PTR_ERR(fb_helper->file);
+		fb_helper->file = NULL;
+		mutex_unlock(&fb_helper->lock);
+		return ret;
+	}
+
+	drm_dropmaster_ioctl(dev, NULL, fb_helper->file);
+
 	width = dev->mode_config.max_width;
 	height = dev->mode_config.max_height;
 
@@ -2478,7 +2491,7 @@ __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper,
 		}
 		mutex_unlock(&fb_helper->lock);
 
-		return ret;
+		goto err_free_file;
 	}
 	drm_setup_crtcs_fb(fb_helper);
 
@@ -2494,7 +2507,7 @@ __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper,
 
 	ret = register_framebuffer(info);
 	if (ret < 0)
-		return ret;
+		goto err_free_file;
 
 	dev_info(dev->dev, "fb%d: %s frame buffer device\n",
 		 info->node, info->fix.id);
@@ -2507,6 +2520,11 @@ __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper,
 	mutex_unlock(&kernel_fb_helper_lock);
 
 	return 0;
+
+err_free_file:
+	drm_file_free(fb_helper->file);
+
+	return ret;
 }
 
 /**
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 33fe959..89757ff 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -154,6 +154,15 @@ struct drm_fb_helper_connector {
 struct drm_fb_helper {
 	struct drm_framebuffer *fb;
 	struct drm_device *dev;
+
+	/**
+	 * @file:
+	 *
+	 * DRM file that can be used with drm_framebuffer_create_dumb() to
+	 * create a framebuffer to back fbdev.
+	 */
+	struct drm_file *file;
+
 	int crtc_count;
 	struct drm_fb_helper_crtc *crtc_info;
 	int connector_count;
-- 
2.7.4