AR5523_MAX_RXCMDSZ
ar->rx_cmd_buf = usb_alloc_coherent(ar->dev, AR5523_MAX_RXCMDSZ,
usb_free_coherent(ar->dev, AR5523_MAX_RXCMDSZ,
AR5523_MAX_RXCMDSZ, ar5523_cmd_rx_cb, ar);
usb_free_coherent(ar->dev, AR5523_MAX_RXCMDSZ, cmd->buf_tx,