diff --git a/src/mesa/drivers/dri/i965/intel_buffer_objects.c b/src/mesa/drivers/dri/i965/intel_buffer_objects.c
index 96dacde..81baf4c 100644
--- a/src/mesa/drivers/dri/i965/intel_buffer_objects.c
+++ b/src/mesa/drivers/dri/i965/intel_buffer_objects.c
@@ -252,7 +252,9 @@ intel_bufferobj_subdata(struct gl_context * ctx,
    if (brw->has_llc) {
       if (offset + size <= intel_obj->gpu_active_start ||
           intel_obj->gpu_active_end <= offset) {
-         drm_intel_gem_bo_map_unsynchronized(intel_obj->buffer);
+      if (drm_intel_gem_bo_map_unsynchronized(intel_obj->buffer) != 0)
+         goto unsynchronized_map_failed;
+
          memcpy(intel_obj->buffer->virtual + offset, data, size);
          drm_intel_bo_unmap(intel_obj->buffer);
 
@@ -262,6 +264,7 @@ intel_bufferobj_subdata(struct gl_context * ctx,
       }
    }
 
+unsynchronized_map_failed:
    busy =
       drm_intel_bo_busy(intel_obj->buffer) ||
       drm_intel_bo_references(brw->batch.bo, intel_obj->buffer);