[PATCH 2/4] drm: Allocate the page flip event earlier

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Can't see why we need to delay the page flip event allocation until the
last moment. Move it earlier to simplify error handling.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/drm_plane.c | 45 +++++++++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 924830071307..d269231d63c5 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -1085,6 +1085,26 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
 		goto put_vblank;
 	}
 
+	if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) {
+		e = kzalloc(sizeof *e, GFP_KERNEL);
+		if (!e) {
+			ret = -ENOMEM;
+			goto put_fb;
+		}
+
+		e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
+		e->event.base.length = sizeof(e->event);
+		e->event.vbl.user_data = page_flip->user_data;
+		e->event.vbl.crtc_id = crtc->base.id;
+
+		ret = drm_event_reserve_init(dev, file_priv, &e->base, &e->event.base);
+		if (ret) {
+			kfree(e);
+			e = NULL;
+			goto put_fb;
+		}
+	}
+
 	drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
 retry:
 	ret = drm_modeset_lock(&crtc->mutex, &ctx);
@@ -1129,26 +1149,6 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
 		goto out;
 	}
 
-	if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) {
-		e = kzalloc(sizeof *e, GFP_KERNEL);
-		if (!e) {
-			ret = -ENOMEM;
-			goto out;
-		}
-
-		e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
-		e->event.base.length = sizeof(e->event);
-		e->event.vbl.user_data = page_flip->user_data;
-		e->event.vbl.crtc_id = crtc->base.id;
-
-		ret = drm_event_reserve_init(dev, file_priv, &e->base, &e->event.base);
-		if (ret) {
-			kfree(e);
-			e = NULL;
-			goto out;
-		}
-	}
-
 	plane->old_fb = plane->fb;
 	if (crtc->funcs->page_flip_target)
 		ret = crtc->funcs->page_flip_target(crtc, fb, e,
@@ -1159,8 +1159,6 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
 		ret = crtc->funcs->page_flip(crtc, fb, e, page_flip->flags,
 					     &ctx);
 	if (ret) {
-		if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT)
-			drm_event_cancel_free(dev, &e->base);
 		/* Keep the old fb, don't unref it. */
 		plane->old_fb = NULL;
 	} else {
@@ -1184,6 +1182,9 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
 	drm_modeset_drop_locks(&ctx);
 	drm_modeset_acquire_fini(&ctx);
 
+	if (ret && e)
+		drm_event_cancel_free(dev, &e->base);
+put_fb:
 	drm_framebuffer_put(fb);
 put_vblank:
 	if (ret && crtc->funcs->page_flip_target)
-- 
2.16.4