drm/i915/ringbuffer: Set ring->gem_buffer = NULL on init unwind

The cleanup path for early abort failed to nullify the gem_buffer. The
likely consequence of this is zero, since a failure here should mean
aborting the module load.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 17 insertions, 14 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 3a0242557220..7823b9648176 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -608,9 +608,10 @@ err:
 int intel_init_ring_buffer(struct drm_device *dev,
                 struct intel_ring_buffer *ring)
 {
-        int ret;
         struct drm_i915_gem_object *obj_priv;
         struct drm_gem_object *obj;
+        int ret;
+
         ring->dev = dev;
 
         if (I915_NEED_GFX_HWS(dev)) {
@@ -623,16 +624,14 @@ int intel_init_ring_buffer(struct drm_device *dev,
         if (obj == NULL) {
                 DRM_ERROR("Failed to allocate ringbuffer\n");
                 ret = -ENOMEM;
-                goto cleanup;
+                goto err_hws;
         }
 
         ring->gem_object = obj;
 
         ret = i915_gem_object_pin(obj, ring->alignment);
-        if (ret != 0) {
-                drm_gem_object_unreference(obj);
-                goto cleanup;
-        }
+        if (ret)
+                goto err_unref;
 
         obj_priv = to_intel_bo(obj);
         ring->map.size = ring->size;
@@ -644,18 +643,14 @@ int intel_init_ring_buffer(struct drm_device *dev,
         drm_core_ioremap_wc(&ring->map, dev);
         if (ring->map.handle == NULL) {
                 DRM_ERROR("Failed to map ringbuffer.\n");
-                i915_gem_object_unpin(obj);
-                drm_gem_object_unreference(obj);
                 ret = -EINVAL;
-                goto cleanup;
+                goto err_unpin;
         }
 
         ring->virtual_start = ring->map.handle;
         ret = ring->init(dev, ring);
-        if (ret != 0) {
-                intel_cleanup_ring_buffer(dev, ring);
-                return ret;
-        }
+        if (ret)
+                goto err_unmap;
 
         if (!drm_core_check_feature(dev, DRIVER_MODESET))
                 i915_kernel_lost_context(dev);
@@ -669,7 +664,15 @@ int intel_init_ring_buffer(struct drm_device *dev,
         INIT_LIST_HEAD(&ring->active_list);
         INIT_LIST_HEAD(&ring->request_list);
         return ret;
-cleanup:
+
+err_unmap:
+        drm_core_ioremapfree(&ring->map, dev);
+err_unpin:
+        i915_gem_object_unpin(obj);
+err_unref:
+        drm_gem_object_unreference(obj);
+        ring->gem_object = NULL;
+err_hws:
         cleanup_status_page(dev, ring);
         return ret;
 }