interrupt: fix request notifier interrupt processing

[ upstream commit aeed570 ]

We should call read() on RTE_INTR_HANDLE_VFIO_REQ event
to confirm that event.

Fixes: 0eb8a1c ("vfio: add request notifier interrupt")

Signed-off-by: Maciej Szwed <maciej.szwed@intel.com>

lib/librte_eal/linux/eal/eal_interrupts.c

@@ -877,17 +877,14 @@ eal_intr_process_interrupts(struct epoll_event *events, int nfds)
 			bytes_read = sizeof(buf.timerfd_num);
 			break;
 #ifdef VFIO_PRESENT
+#ifdef HAVE_VFIO_DEV_REQ_INTERFACE
+		case RTE_INTR_HANDLE_VFIO_REQ:
+#endif
 		case RTE_INTR_HANDLE_VFIO_MSIX:
 		case RTE_INTR_HANDLE_VFIO_MSI:
 		case RTE_INTR_HANDLE_VFIO_LEGACY:
 			bytes_read = sizeof(buf.vfio_intr_count);
 			break;
-#ifdef HAVE_VFIO_DEV_REQ_INTERFACE
-		case RTE_INTR_HANDLE_VFIO_REQ:
-			bytes_read = 0;
-			call = true;
-			break;
-#endif
 #endif
 		case RTE_INTR_HANDLE_VDEV:
 		case RTE_INTR_HANDLE_EXT: