Merge branch 'linux-next' of https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git

1 files changed, 18 insertions, 3 deletions

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 7f6cbe851d1e..019bcae81af5 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1964,13 +1964,28 @@ static const struct file_operations portdev_fops = {
 static void remove_vqs(struct ports_device *portdev)
 {
 	struct virtqueue *vq;
+	bool multiport = use_multiport(portdev);
 
 	virtio_device_for_each_vq(portdev->vdev, vq) {
 		struct port_buffer *buf;
+		unsigned int len;
 
-		flush_bufs(vq, true);
-		while ((buf = virtqueue_detach_unused_buf(vq)))
-			free_buf(buf, true);
+		/*
+		 * c_ovq cookies are &portdev->cpkt, not port_buffer.
+		 * Detach them but do not free_buf().
+		 */
+		if (multiport && vq == portdev->c_ovq) {
+			spin_lock(&portdev->c_ovq_lock);
+			while (virtqueue_get_buf(vq, &len))
+				;
+			while (virtqueue_detach_unused_buf(vq))
+				;
+			spin_unlock(&portdev->c_ovq_lock);
+		} else {
+			flush_bufs(vq, true);
+			while ((buf = virtqueue_detach_unused_buf(vq)))
+				free_buf(buf, true);
+		}
 		cond_resched();
 	}
 	portdev->vdev->config->del_vqs(portdev->vdev);