1 files changed, 4 insertions, 2 deletions
diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index 016543da01f..e4bdc6f1e79 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -951,8 +951,10 @@ _mesa_BufferDataARB(GLenum target, GLsizeiptrARB size,
    }
    
    if (bufObj->Pointer) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "glBufferDataARB(buffer is mapped)" );
-      return;
+      /* Unmap the existing buffer.  We'll replace it now.  Not an error. */
+      ctx->Driver.UnmapBuffer(ctx, target, bufObj);
+      bufObj->Access = DEFAULT_ACCESS;
+      bufObj->Pointer = NULL;
    }  
 
    ASSERT(ctx->Driver.BufferData);