diff mbox series

[v4,02/22] hw/virtio: gracefully handle unset vhost_dev vdev

Message ID 20220802095010.3330793-3-alex.bennee@linaro.org
State Superseded
Headers show
Series virtio-gpio and various virtio cleanups | expand

Commit Message

Alex Bennée Aug. 2, 2022, 9:49 a.m. UTC 
I've noticed asserts firing because we query the status of vdev after
a vhost connection is closed down. Rather than faulting on the NULL
indirect just quietly reply false.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220726192150.2435175-8-alex.bennee@linaro.org>
---
 hw/virtio/vhost.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

Comments

Philippe Mathieu-Daudé Sept. 22, 2022, 9:59 p.m. UTC | #1 
On 2/8/22 11:49, Alex Bennée wrote:
> I've noticed asserts firing because we query the status of vdev after
> a vhost connection is closed down. Rather than faulting on the NULL
> indirect just quietly reply false.
> 
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> Message-Id: <20220726192150.2435175-8-alex.bennee@linaro.org>
> ---
>   hw/virtio/vhost.c | 10 +++++++---
>   1 file changed, 7 insertions(+), 3 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
diff mbox series

Patch

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 0827d631c0..f758f177bb 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -306,7 +306,7 @@  static inline void vhost_dev_log_resize(struct vhost_dev *dev, uint64_t size)
     dev->log_size = size;
 }
 
-static int vhost_dev_has_iommu(struct vhost_dev *dev)
+static bool vhost_dev_has_iommu(struct vhost_dev *dev)
 {
     VirtIODevice *vdev = dev->vdev;
 
@@ -316,8 +316,12 @@  static int vhost_dev_has_iommu(struct vhost_dev *dev)
      * does not have IOMMU, there's no need to enable this feature
      * which may cause unnecessary IOTLB miss/update transactions.
      */
-    return virtio_bus_device_iommu_enabled(vdev) &&
-           virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
+    if (vdev) {
+        return virtio_bus_device_iommu_enabled(vdev) &&
+            virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
+    } else {
+        return false;
+    }
 }
 
 static void *vhost_memory_map(struct vhost_dev *dev, hwaddr addr,