virtio-serial: add missing virtio_detach_element() call
Ports enter a "throttled" state when writing to the chardev would block. The current output VirtQueueElement is kept around until the chardev becomes writable again. There are several places in the virtio-serial lifecycle where the VirtQueueElement should be thrown away. For example, if the virtio device is reset then virtqueue elements are no longer valid. This patch adds the discard_throttle_data() function to unmap the scatter-gather list and decrement vq->inuse. This ensures that the VirtQueueElement is freed properly. Cc: amit.shah@redhat.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Tested-by: NLadi Prosek <lprosek@redhat.com> Reviewed-by: NLadi Prosek <lprosek@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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