drm/i915: fix oops on agp=off

From Kernel BZ 10289 - not sure why anyone would boot an intel with no agp
but it shouldn't crash.

Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/char/drm/i915_dma.c b/drivers/char/drm/i915_dma.c
index e9d6663..a043bb1 100644 (file)
--- a/drivers/char/drm/i915_dma.c
+++ b/drivers/char/drm/i915_dma.c
@@ -804,6 +804,9 @@ void i915_driver_lastclose(struct drm_device * dev)
 {
        drm_i915_private_t *dev_priv = dev->dev_private;
 
+       if (!dev_priv)
+               return;
+
        if (dev_priv->agp_heap)
                i915_mem_takedown(&(dev_priv->agp_heap));