drm/i915: Clean up aliasing ppgtt correctly on error paths

While at it inline the free functions - they don't actually free the
ppgtt, just clean up the allocations done for it.
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -672,8 +672,10 @@ static void gen8_free_page_tables(struct i915_page_directory *pd, struct drm_dev
 	}
 }
 
-static void gen8_ppgtt_free(struct i915_hw_ppgtt *ppgtt)
+static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
 {
+	struct i915_hw_ppgtt *ppgtt =
+		container_of(vm, struct i915_hw_ppgtt, base);
 	int i;
 
 	for_each_set_bit(i, ppgtt->pdp.used_pdpes, GEN8_LEGACY_PDPES) {
@@ -688,14 +690,6 @@ static void gen8_ppgtt_free(struct i915_hw_ppgtt *ppgtt)
 	unmap_and_free_pt(ppgtt->scratch_pt, ppgtt->base.dev);
 }
 
-static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
-{
-	struct i915_hw_ppgtt *ppgtt =
-		container_of(vm, struct i915_hw_ppgtt, base);
-
-	gen8_ppgtt_free(ppgtt);
-}
-
 /**
  * gen8_ppgtt_alloc_pagetabs() - Allocate page tables for VA range.
  * @ppgtt:	Master ppgtt structure.
@@ -1454,11 +1448,16 @@ static int gen6_alloc_va_range(struct i915_address_space *vm,
 	return ret;
 }
 
-static void gen6_ppgtt_free(struct i915_hw_ppgtt *ppgtt)
+static void gen6_ppgtt_cleanup(struct i915_address_space *vm)
 {
+	struct i915_hw_ppgtt *ppgtt =
+		container_of(vm, struct i915_hw_ppgtt, base);
 	struct i915_page_table *pt;
 	uint32_t pde;
 
+
+	drm_mm_remove_node(&ppgtt->node);
+
 	gen6_for_all_pdes(pt, ppgtt, pde) {
 		if (pt != ppgtt->scratch_pt)
 			unmap_and_free_pt(pt, ppgtt->base.dev);
@@ -1468,16 +1467,6 @@ static void gen6_ppgtt_free(struct i915_hw_ppgtt *ppgtt)
 	unmap_and_free_pd(&ppgtt->pd, ppgtt->base.dev);
 }
 
-static void gen6_ppgtt_cleanup(struct i915_address_space *vm)
-{
-	struct i915_hw_ppgtt *ppgtt =
-		container_of(vm, struct i915_hw_ppgtt, base);
-
-	drm_mm_remove_node(&ppgtt->node);
-
-	gen6_ppgtt_free(ppgtt);
-}
-
 static int gen6_ppgtt_allocate_page_directories(struct i915_hw_ppgtt *ppgtt)
 {
 	struct drm_device *dev = ppgtt->base.dev;
@@ -2268,6 +2257,7 @@ static int i915_gem_setup_global_gtt(struct drm_device *dev,
 
 		ret = __hw_ppgtt_init(dev, ppgtt, true);
 		if (ret) {
+			ppgtt->base.cleanup(&ppgtt->base);
 			kfree(ppgtt);
 			return ret;
 		}