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virtio_console: reset on out of memory

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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>
This commit is contained in:
Michael S. Tsirkin 2018-04-20 21:00:13 +03:00
parent aa44ec8670
commit 5c60300d68
1 changed files with 10 additions and 7 deletions
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17
drivers/char/virtio_console.c
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@ -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: