> /*
> + * Process CRBs that we receive on the fault window.
> + */
> +irqreturn_t vas_fault_handler(int irq, void *data)
> +{
> + struct vas_instance *vinst = data;
> + struct coprocessor_request_block buf, *crb;
> + struct vas_window *window;
> + void *fifo;
> +
> + /*
> + * VAS can interrupt with multiple page faults. So process all
> + * valid CRBs within fault FIFO until reaches invalid CRB.
> + * NX updates nx_fault_stamp in CRB and pastes in fault FIFO.
> + * kernel retrives send window from parition send window ID
> + * (pswid) in nx_fault_stamp. So pswid should be non-zero and
> + * use this to check whether CRB is valid.
> + * After reading CRB entry, it is reset with 0's in fault FIFO.
> + *
> + * In case kernel receives another interrupt with different page
> + * fault and CRBs are processed by the previous handling, will be
> + * returned from this function when it sees invalid CRB (means 0's).
> + */
> + do {
> + mutex_lock(&vinst->mutex);
This isn't going to work.
>From Documentation/locking/mutex-design.rst
- Mutexes may not be used in hardware or software interrupt
contexts such as tasklets and timers.
Mikey
