for (i = 0; i < size; ++i) {
struct ibmvfc_event *evt = &pool->events[i];
+ /*
+ * evt->active states
+ * 1 = in flight
+ * 0 = being completed
+ * -1 = free/freed
+ */
+ atomic_set(&evt->active, -1);
atomic_set(&evt->free, 1);
evt->crq.valid = 0x80;
evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
BUG_ON(!ibmvfc_valid_event(pool, evt));
BUG_ON(atomic_inc_return(&evt->free) != 1);
+ BUG_ON(atomic_dec_and_test(&evt->active));
spin_lock_irqsave(&evt->queue->l_lock, flags);
list_add_tail(&evt->queue_list, &evt->queue->free);
**/
static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
{
+ /*
+ * Anything we are failing should still be active. Otherwise, it
+ * implies we already got a response for the command and are doing
+ * something bad like double completing it.
+ */
+ BUG_ON(!atomic_dec_and_test(&evt->active));
if (evt->cmnd) {
evt->cmnd->result = (error_code << 16);
evt->done = ibmvfc_scsi_eh_done;
evt->done(evt);
} else {
+ atomic_set(&evt->active, 1);
spin_unlock_irqrestore(&evt->queue->l_lock, flags);
ibmvfc_trc_start(evt);
}
return;
}
- if (unlikely(atomic_read(&evt->free))) {
+ if (unlikely(atomic_dec_if_positive(&evt->active))) {
dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
crq->ioba);
return;
return;
}
- if (unlikely(atomic_read(&evt->free))) {
+ if (unlikely(atomic_dec_if_positive(&evt->active))) {
dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
crq->ioba);
return;