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virtio: reenable config if freezing device failed

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commit 310227f42882c52356b523e2f4e11690eebcd2ab upstream.

Currently, we don't reenable the config if freezing the device failed.

For example, virtio-mem currently doesn't support suspend+resume, and
trying to freeze the device will always fail. Afterwards, the device
will no longer respond to resize requests, because it won't get notified
about config changes.

Let's fix this by re-enabling the config if freezing fails.

Fixes: 22b7050a02 ("virtio: defer config changed notifications")
Cc: <stable@kernel.org>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20240213135425.795001-1-david@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 5908fb34c0cf62c0f25f916d50d00582b053e077)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
This commit is contained in:
David Hildenbrand
2024-02-13 14:54:25 +01:00
committed by Ansh
parent afdf13d008
commit 51e989fb53
1 changed files with 8 additions and 2 deletions
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10
drivers/virtio/virtio.c
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@@ -364,13 +364,19 @@ EXPORT_SYMBOL_GPL(unregister_virtio_device);
int virtio_device_freeze(struct virtio_device *dev)
{
struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
int ret;
virtio_config_disable(dev);
dev->failed = dev->config->get_status(dev) & VIRTIO_CONFIG_S_FAILED;
if (drv && drv->freeze)
return drv->freeze(dev);
if (drv && drv->freeze) {
ret = drv->freeze(dev);
if (ret) {
virtio_config_enable(dev);
return ret;
}
}
return 0;
}