
int spi_sync(struct spi_device *spi, struct spi_message *message)
{
    int ret;
    struct spi_controller *controller = spi->controller;

    mutex_lock(&controller->bus_lock_mutex);
    ret = __spi_sync(spi, message);
    if (spi && spi->controller)
        mutex_unlock(&spi->controller->bus_lock_mutex);
    else
        mutex_unlock(&controller->bus_lock_mutex);

    return ret;
}
