drm/i915: Clear fence registers on GPU reset

When the GPU is reset, the fence registers are invalidated, so release
the objects and clear them out.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c033c5a..db9d36f 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1826,10 +1826,11 @@
 	}
 }
 
-void i915_gem_reset_lists(struct drm_device *dev)
+void i915_gem_reset(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_i915_gem_object *obj_priv;
+	int i;
 
 	i915_gem_reset_ring_lists(dev_priv, &dev_priv->render_ring);
 	if (HAS_BSD(dev))
@@ -1858,6 +1859,17 @@
 	{
 		obj_priv->base.read_domains &= ~I915_GEM_GPU_DOMAINS;
 	}
+
+	/* The fence registers are invalidated so clear them out */
+	for (i = 0; i < 16; i++) {
+		struct drm_i915_fence_reg *reg;
+
+		reg = &dev_priv->fence_regs[i];
+		if (!reg->obj)
+			continue;
+
+		i915_gem_clear_fence_reg(reg->obj);
+	}
 }
 
 /**