drm: Add missing drm_vblank_put() along queue vblank error path

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Kristian Høgsberg <krh@bitplanet.net>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 9d3a5030b6e1dfcfbf522a783d24f14816c7b813..722700d5d73ee69a6ac49d4fbd96d307f704c2bb 100644 (file)
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -585,10 +585,13 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
        struct timeval now;
        unsigned long flags;
        unsigned int seq;
+       int ret;
 
        e = kzalloc(sizeof *e, GFP_KERNEL);
-       if (e == NULL)
-               return -ENOMEM;
+       if (e == NULL) {
+               ret = -ENOMEM;
+               goto err_put;
+       }
 
        e->pipe = pipe;
        e->base.pid = current->pid;
@@ -603,9 +606,8 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
        spin_lock_irqsave(&dev->event_lock, flags);
 
        if (file_priv->event_space < sizeof e->event) {
-               spin_unlock_irqrestore(&dev->event_lock, flags);
-               kfree(e);
-               return -ENOMEM;
+               ret = -EBUSY;
+               goto err_unlock;
        }
 
        file_priv->event_space -= sizeof e->event;
@@ -638,6 +640,13 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
        spin_unlock_irqrestore(&dev->event_lock, flags);
 
        return 0;
+
+err_unlock:
+       spin_unlock_irqrestore(&dev->event_lock, flags);
+       kfree(e);
+err_put:
+       drm_vblank_put(dev, e->pipe);
+       return ret;
 }
 
 /**