drm/i915: reset the GPU on context fini

It's the only way we know how to make the GPU actually forget about the
default context.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 5642c40..6dc426a 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -278,6 +278,8 @@
 	i915_gem_object_unpin(dev_priv->ring[RCS].default_context->obj);
 
 	do_destroy(dev_priv->ring[RCS].default_context);
+
+	intel_gpu_reset(dev);
 }
 
 void i915_gem_context_open(struct drm_device *dev, struct drm_file *file)