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virtio_console: fix uninitialized variable use 

We try to disable callbacks on c_ivq even without multiport
even though that vq is not initialized in this configuration.

Fixes: c743d09dbd ("virtio: console: Disable callbacks for virtqueues at start of S4 freeze")
Suggested-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2017-03-29 23:22:04 +03:00
parent fe36cbe067
commit 2055997f98
1 changed files with 4 additions and 2 deletions
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6
drivers/char/virtio_console.c
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@ -2202,14 +2202,16 @@ static int virtcons_freeze(struct virtio_device *vdev)
vdev->config->reset(vdev);
virtqueue_disable_cb(portdev->c_ivq);
if (use_multiport(portdev))
virtqueue_disable_cb(portdev->c_ivq);
cancel_work_sync(&portdev->control_work);
cancel_work_sync(&portdev->config_work);
/*
* Once more: if control_work_handler() was running, it would
* enable the cb as the last step.
*/
virtqueue_disable_cb(portdev->c_ivq);
if (use_multiport(portdev))
virtqueue_disable_cb(portdev->c_ivq);
remove_controlq_data(portdev);
list_for_each_entry(port, &portdev->ports, list) {