Re: [PATCH net V2 1/2] virtio-net: don't respond to cpu hotplug notifier if we're not ready

Jason Wang [off-list ref] writes:

We're trying to re-configure the affinity unconditionally in cpu hotplug
callback. This may lead the issue during resuming from s3/s4 since

- virt queues haven't been allocated at that time.
- it's unnecessary since thaw method will re-configure the affinity.

Fix this issue by checking the config_enable and do nothing is we're not ready.

The bug were introduced by commit 8de4b2f3ae90c8fc0f17eeaab87d5a951b66ee17
(virtio-net: reset virtqueue affinity when doing cpu hotplug).

Cc: Rusty Russell <redacted>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Wanlong Gao <redacted>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Wanlong Gao <redacted>
Signed-off-by: Jason Wang <redacted>
---
The patch is need for 3.8 and above.

Please put 'CC: stable@kernel.org # 3.8+' in the commit.

(The specification of the stable line is poor, but that seems to be one
common method).

Cheers,
Rusty.