5.15-stable review patch. If anyone has any objections, please let me know.
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From: David Hildenbrand david@redhat.com
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: 22b7050a024d ("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 --- drivers/virtio/virtio.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
--- a/drivers/virtio/virtio.c +++ b/drivers/virtio/virtio.c @@ -455,13 +455,19 @@ EXPORT_SYMBOL_GPL(unregister_virtio_devi 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; }