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virtio: console: Disable callbacks for virtqueues at start of S4 freeze 

To ensure we don't receive any more interrupts from the host after we
enter the freeze function, disable all vq interrupts.

There wasn't any problem seen due to this in tests, but applying this
patch makes the freeze case more robust.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Amit Shah 2012-01-06 16:19:08 +05:30 committed by Rusty Russell
parent 2b8f41d846
commit c743d09dbd
1 changed files with 8 additions and 0 deletions
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8
drivers/char/virtio_console.c
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@ -1854,10 +1854,18 @@ static int virtcons_freeze(struct virtio_device *vdev)
vdev->config->reset(vdev);
virtqueue_disable_cb(portdev->c_ivq);
cancel_work_sync(&portdev->control_work);
/*
* Once more: if control_work_handler() was running, it would
* enable the cb as the last step.
*/
virtqueue_disable_cb(portdev->c_ivq);
remove_controlq_data(portdev);
list_for_each_entry(port, &portdev->ports, list) {
virtqueue_disable_cb(port->in_vq);
virtqueue_disable_cb(port->out_vq);
/*
* We'll ask the host later if the new invocation has
* the port opened or closed.