i915: Clear sarea_priv during lastclose.

sarea_priv needs to be NULL before i915_initialized is called to
properly reset it.  The stale value produces a panic any time something
opens/closes drm without calling initialize.  i.e. version checking

diff --git a/shared-core/i915_dma.c b/shared-core/i915_dma.c
index 84aafaae57077a40f001031cbab956e7f56320ee..77b4181ce57248a13485a1919fe21ff15abb6f4f 100644 (file)
--- a/shared-core/i915_dma.c
+++ b/shared-core/i915_dma.c
@@ -1142,6 +1142,8 @@ void i915_driver_lastclose(struct drm_device * dev)
 
        if (drm_getsarea(dev) && dev_priv->sarea_priv)
                i915_do_cleanup_pageflip(dev);
+       if (dev_priv->sarea_priv)
+               dev_priv->sarea_priv = NULL;
        if (dev_priv->agp_heap)
                i915_mem_takedown(&(dev_priv->agp_heap));
 #if defined(I915_HAVE_BUFFER)