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virtio_balloon: set DRIVER_OK before using device 

virtio spec requires that all drivers set DRIVER_OK
before using devices. While balloon isn't yet
included in the virtio 1 spec, previous spec versions
also required this.

virtio balloon might violate this rule: probe calls
kthread_run before setting DRIVER_OK, which might run
immediately and cause balloon to inflate/deflate.

To fix, call virtio_device_ready before running the kthread.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
This commit is contained in:
Michael S. Tsirkin 2015-03-05 13:24:41 +10:30 committed by Rusty Russell
parent eeb8a7e8bb
commit 88660f7fb9
1 changed files with 2 additions and 0 deletions
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2
drivers/virtio/virtio_balloon.c
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@ -499,6 +499,8 @@ static int virtballoon_probe(struct virtio_device *vdev)
if (err < 0)
goto out_oom_notify;
virtio_device_ready(vdev);
vb->thread = kthread_run(balloon, vb, "vballoon");
if (IS_ERR(vb->thread)) {
err = PTR_ERR(vb->thread);