Now they don't make code more readable. Let's better put the whole
logic into virtio_queue_set_guest_notifier().

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
---
 hw/virtio/virtio.c | 76 +++++++++++-----------------------------------
 1 file changed, 17 insertions(+), 59 deletions(-)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 704bc7943f..4184aff75c 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -3804,74 +3804,32 @@ static void virtio_config_guest_notifier_read(EventNotifier *n)
     }
 }
 
-static void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq,
-                                                       bool assign,
-                                                       bool with_irqfd)
-{
-    if (assign && !with_irqfd) {
-        event_notifier_set_handler(&vq->guest_notifier,
-                                   virtio_queue_guest_notifier_read);
-    } else {
-        event_notifier_set_handler(&vq->guest_notifier, NULL);
-    }
-    if (!assign) {
-        /* Test and clear notifier before closing it,
-         * in case poll callback didn't have time to run. */
-        virtio_queue_guest_notifier_read(&vq->guest_notifier);
-    }
-}
-
-static void virtio_config_set_guest_notifier_fd_handler(VirtIODevice *vdev,
-                                                 bool assign, bool with_irqfd)
-{
-    EventNotifier *n;
-    n = &vdev->config_notifier;
-    if (assign && !with_irqfd) {
-        event_notifier_set_handler(n, virtio_config_guest_notifier_read);
-    } else {
-        event_notifier_set_handler(n, NULL);
-    }
-    if (!assign) {
-        /* Test and clear notifier before closing it,*/
-        /* in case poll callback didn't have time to run. */
-        virtio_config_guest_notifier_read(n);
-    }
-}
-
-static void virtio_pci_set_guest_notifier_fd_handler(VirtIODevice *vdev,
-                                                     VirtQueue *vq,
-                                                     int n, bool assign,
-                                                     bool with_irqfd)
-{
-    if (n == VIRTIO_CONFIG_IRQ_IDX) {
-        virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd);
-    } else {
-        virtio_queue_set_guest_notifier_fd_handler(vq, assign, with_irqfd);
-    }
-}
-
 int virtio_queue_set_guest_notifier(VirtIODevice *vdev, int n, bool assign,
                                     bool with_irqfd)
 {
-    VirtQueue *vq = NULL;
-    EventNotifier *notifier = NULL;
-
-    if (n == VIRTIO_CONFIG_IRQ_IDX) {
-        notifier = virtio_config_get_guest_notifier(vdev);
-    } else {
-        vq = virtio_get_queue(vdev, n);
-        notifier = virtio_queue_get_guest_notifier(vq);
-    }
+    bool is_config = n == VIRTIO_CONFIG_IRQ_IDX;
+    VirtQueue *vq = is_config ? NULL : virtio_get_queue(vdev, n);
+    EventNotifier *notifier = is_config ?
+        virtio_config_get_guest_notifier(vdev) :
+        virtio_queue_get_guest_notifier(vq);
+    EventNotifierHandler *read_fn = is_config ?
+        virtio_config_guest_notifier_read :
+        virtio_queue_guest_notifier_read;
 
     if (assign) {
         int r = event_notifier_init(notifier, 0);
         if (r < 0) {
             return r;
         }
-        virtio_pci_set_guest_notifier_fd_handler(vdev, vq, n, true, with_irqfd);
-    } else {
-        virtio_pci_set_guest_notifier_fd_handler(vdev, vq, n, false,
-                                                 with_irqfd);
+    }
+
+    event_notifier_set_handler(notifier,
+                               (assign && !with_irqfd) ? read_fn : NULL);
+
+    if (!assign) {
+        /* Test and clear notifier before closing it,*/
+        /* in case poll callback didn't have time to run. */
+        read_fn(notifier);
         event_notifier_cleanup(notifier);
     }
 
-- 
2.48.1