Patch "virtio: reenable config if freezing device failed" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    virtio: reenable config if freezing device failed

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     virtio-reenable-config-if-freezing-device-failed.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 16e1a2fdc49b655af748263beb7253266a3dbd02
Author: David Hildenbrand <david@xxxxxxxxxx>
Date:   Tue Feb 13 14:54:25 2024 +0100

    virtio: reenable config if freezing device failed
    
    [ Upstream commit 310227f42882c52356b523e2f4e11690eebcd2ab ]
    
    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@xxxxxxxxxx>
    Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
    Cc: Jason Wang <jasowang@xxxxxxxxxx>
    Cc: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
    Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
    Message-Id: <20240213135425.795001-1-david@xxxxxxxxxx>
    Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 3893dc29eb263..71dee622b771b 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -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;
 }