virtio_console: reset on out of memory

commit 5c60300d68da32ca77f7f978039dc72bfc78b06b upstream.

When out of memory and we can't add ctrl vq buffers,
probe fails. Unfortunately the error handling is
out of spec: it calls del_vqs without bothering
to reset the device first.

To fix, call the full cleanup function in this case.

Cc: stable@vger.kernel.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index bcf0376..a089474 100644 (file)
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -2090,6 +2090,7 @@ static int virtcons_probe(struct virtio_device *vdev)
 
        spin_lock_init(&portdev->ports_lock);
        INIT_LIST_HEAD(&portdev->ports);
+       INIT_LIST_HEAD(&portdev->list);
 
        virtio_device_ready(portdev->vdev);
 
@@ -2107,8 +2108,15 @@ static int virtcons_probe(struct virtio_device *vdev)
                if (!nr_added_bufs) {
                        dev_err(&vdev->dev,
                                "Error allocating buffers for control queue\n");
-                       err = -ENOMEM;
-                       goto free_vqs;
+                       /*
+                        * The host might want to notify mgmt sw about device
+                        * add failure.
+                        */
+                       __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID,
+                                          VIRTIO_CONSOLE_DEVICE_READY, 0);
+                       /* Device was functional: we need full cleanup. */
+                       virtcons_remove(vdev);
+                       return -ENOMEM;
                }
        } else {
                /*
@@ -2139,11 +2147,6 @@ static int virtcons_probe(struct virtio_device *vdev)
 
        return 0;
 
-free_vqs:
-       /* The host might want to notify mgmt sw about device add failure */
-       __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID,
-                          VIRTIO_CONSOLE_DEVICE_READY, 0);
-       remove_vqs(portdev);
 free_chrdev:
        unregister_chrdev(portdev->chr_major, "virtio-portsdev");
 free: