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virtio: reenable config if freezing device failed 

[ Upstream commit 310227f428 ]

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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Hildenbrand 2024-02-13 14:54:25 +01:00 committed by Greg Kroah-Hartman
parent 20767659d6
commit 98a729f077
1 changed files with 8 additions and 2 deletions
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10
drivers/virtio/virtio.c
View File

@ -489,13 +489,19 @@ 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;
}