commit df72f01104ae9a68f356ae412776b209f04d27cc
author Mathieu Poirier <mathieu.poirier@linaro.org> Wed Oct 25 11:18:41 2023 -0600
committer Michael S. Tsirkin <mst@redhat.com> Mon Dec 25 11:34:55 2023 -0500
tree f7144562aabbbc6b4fd2c01de8c965719cd60bb8
parent 80f1709aa0eb4de09b4240563463f991a5b9d855

virtio: rng: Check notifier helpers for VIRTIO_CONFIG_IRQ_IDX

Since the driver doesn't support interrupts, we must return early when
index is set to VIRTIO_CONFIG_IRQ_IDX.  Basically the same thing Viresh
did for "91208dd297f2 virtio: i2c: Check notifier helpers for
VIRTIO_CONFIG_IRQ_IDX".

Fixes: 544f0278afca ("virtio: introduce macro VIRTIO_CONFIG_IRQ_IDX")
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Message-Id: <20231025171841.3379663-1-mathieu.poirier@linaro.org>
Tested-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/virtio/vhost-user-rng.c

diff --git a/hw/virtio/vhost-user-rng.c b/hw/virtio/vhost-user-rng.c
index efc54cd..24ac1a2 100644
--- a/hw/virtio/vhost-user-rng.c
+++ b/hw/virtio/vhost-user-rng.c
@@ -129,6 +129,14 @@
 {
     VHostUserRNG *rng = VHOST_USER_RNG(vdev);
 
+    /*
+     * We don't support interrupts, return early if index is set to
+     * VIRTIO_CONFIG_IRQ_IDX.
+     */
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return;
+    }
+
     vhost_virtqueue_mask(&rng->vhost_dev, vdev, idx, mask);
 }
 
@@ -136,6 +144,14 @@
 {
     VHostUserRNG *rng = VHOST_USER_RNG(vdev);
 
+    /*
+     * We don't support interrupts, return early if index is set to
+     * VIRTIO_CONFIG_IRQ_IDX.
+     */
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return false;
+    }
+
     return vhost_virtqueue_pending(&rng->vhost_dev, idx);
 }