Revert "Revert "drm/i810: cleanup reclaim_buffers""

This reverts commit 6e877b576d,
reinstating the original commit:

commit 87499ffdcb
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Tue Oct 25 23:51:24 2011 +0200

    drm/i810: cleanup reclaim_buffers

    My dear old i815 always hits the deadlocked on reclaim_buffers
    warning. Switch over to the idlelock duct-tape on hope that
    works better. I've fired up my i815 and now closing glxgears doesn't
    take 5 seconds anymore. \o/

The original problem with that was that I've moved it ahead in the
series so that it could be included despite some patches not being
ready quite yet. The little problem is that this patch required some
of the previous rework to work correctly.

Now that everything is in the right order again, this actually works
on my i810 and does speed up closing gl apps as the original commit
claimed. Without hanging the machine, as the revert says.

Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/i810/i810_dma.c

@@ -881,7 +881,7 @@ static int i810_flush_queue(struct drm_device *dev)
 }
 
 /* Must be called with the lock held */
-static void i810_reclaim_buffers(struct drm_device *dev,
+void i810_driver_reclaim_buffers(struct drm_device *dev,
 				 struct drm_file *file_priv)
 {
 	struct drm_device_dma *dma = dev->dma;
@@ -1220,12 +1220,17 @@ void i810_driver_preclose(struct drm_device *dev, struct drm_file *file_priv)
 		if (dev_priv->page_flipping)
 			i810_do_cleanup_pageflip(dev);
 	}
-}
 
-void i810_driver_reclaim_buffers_locked(struct drm_device *dev,
-					struct drm_file *file_priv)
-{
-	i810_reclaim_buffers(dev, file_priv);
+	if (file_priv->master && file_priv->master->lock.hw_lock) {
+		drm_idlelock_take(&file_priv->master->lock);
+		i810_driver_reclaim_buffers(dev, file_priv);
+		drm_idlelock_release(&file_priv->master->lock);
+	} else {
+		/* master disappeared, clean up stuff anyway and hope nothing
+		 * goes wrong */
+		i810_driver_reclaim_buffers(dev, file_priv);
+	}
+
 }
 
 int i810_driver_dma_quiescent(struct drm_device *dev)