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 4.19-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-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 310227f42882c52356b523e2f4e11690eebcd2ab Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david@xxxxxxxxxx>
Date: Tue, 13 Feb 2024 14:54:25 +0100
Subject: virtio: reenable config if freezing device failed
From: David Hildenbrand <david@xxxxxxxxxx>
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@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: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/virtio/virtio.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -376,13 +376,19 @@ 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;
}
Patches currently in stable-queue which might be from david@xxxxxxxxxx are
queue-4.19/x86-mm-pat-fix-vm_pat-handling-in-cow-mappings.patch
queue-4.19/mm-migrate-set-swap-entry-values-of-thp-tail-pages-properly.patch
queue-4.19/virtio-reenable-config-if-freezing-device-failed.patch
