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Subject[PATCH 4.4 116/132] virtio_console: reset on out of memory
Date
From: Michael S. Tsirkin <mst@redhat.com>

[ Upstream commit 5c60300d68da32ca77f7f978039dc72bfc78b06b ]

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: Sasha Levin <sashal@kernel.org>
---
drivers/char/virtio_console.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index df9eab91c2d25..78aab6e246e13 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -2067,6 +2067,7 @@ 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);

@@ -2084,8 +2085,15 @@ 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 {
/*
@@ -2116,11 +2124,6 @@ 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:
--
2.20.1


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