*
* This writes the EVQ_RPTR_REG register for the specified channel's
* event queue.
- *
- * Note that EVQ_RPTR_REG contains the index of the "last read" event,
- * whereas channel->eventq_read_ptr contains the index of the "next to
- * read" event.
*/
void efx_nic_eventq_read_ack(struct efx_channel *channel)
{
efx->last_irq_cpu = raw_smp_processor_id();
EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_DWORD_FMT "\n",
irq, raw_smp_processor_id(), EFX_DWORD_VAL(reg));
+ } else if (EFX_WORKAROUND_15783(efx)) {
+ /* We can't return IRQ_HANDLED more than once on seeing ISR0=0
+ * because this might be a shared interrupt, but we do need to
+ * check the channel every time and preemptively rearm it if
+ * it's idle. */
+ efx_for_each_channel(channel, efx) {
+ if (!channel->work_pending)
+ efx_nic_eventq_read_ack(channel);
+ }
}
return result;