softpipe: transfer flush

src/gallium/drivers/softpipe/sp_texture.c

@@ -416,6 +416,7 @@ softpipe_init_texture_funcs(struct pipe_context *pipe)
    pipe->transfer_map = softpipe_transfer_map;
    pipe->transfer_unmap = softpipe_transfer_unmap;
 
+   pipe->transfer_flush_region = u_transfer_flush_region_noop;
    pipe->transfer_inline_write = u_transfer_inline_write;
    pipe->transfer_inline_read = u_transfer_inline_read;
 }