Linux Device Drivers Development

The interrupt handler

So far, we have only dealt with two different interrupts: when a new packet has arrived and when the transmission of an outgoing packet is complete. But nowadays hardware interfaces are becoming smart, and are able to report their status either for sanity purposes, or for data transfer purposes. This way, network interfaces can also generate interrupts to signal errors, link status changes, and so on. They should all be handled in the interrupt handler.

This is what our hwrirq handler looks like:

static irqreturn_t my_netdev_irq(int irq, void *dev_id) { struct priv_net_struct *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 ...