irq

static irqreturn_t enc28j60_irq(int irq, void *dev_id)
{
    struct enc28j60_net *priv = dev_id;

    /*
     * Can't do anything in interrupt context because we need to
     * block (spi_sync() is blocking) so fire of the interrupt
     * handling workqueue.
     * Remember that we access enc28j60 registers through SPI bus
     * via spi_sync() call.
     */
    schedule_work(&priv->irq_work);

    return IRQ_HANDLED;
}