Man page 9 : mpt_interrupt

mpt_interrupt - MPT adapter (IOC) specific interrupt handler.

irqreturn_t mpt_interrupt(int  irq , void *  bus_id );

irq
    irq number (not used)

bus_id
    bus identifier cookie == pointer to MPT_ADAPTER structure

This routine is registered via the request_irq kernel API call, and handles all interrupts generated from a specific MPT adapter (also referred to as a IO Controller or IOC). This routine must clear the interrupt from the adapter and does so by reading the reply FIFO. Multiple replies may be processed per single call to this routine.

This routine handles register-level access of the adapter but dispatches (calls) a protocol-specific callback routine to handle the protocol-specific details of the MPT request completion.