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virtio: fix balloon without VIRTIO_BALLOON_F_STATS_VQ 

When running under qemu-kvm-0.11.0:

	BUG: unable to handle kernel paging request at 56e58955
	...
	Process vballoon (pid: 1297, ti=c7976000 task=c70a6ca0 task.ti=c7
	...
	Call Trace:
	 [<c88253a3>] ? balloon+0x1b3/0x440 [virtio_balloon]
	 [<c041c2d7>] ? schedule+0x327/0x9d0
	 [<c88251f0>] ? balloon+0x0/0x440 [virtio_balloon]
	 [<c014a2d4>] ? kthread+0x74/0x80
	 [<c014a260>] ? kthread+0x0/0x80
	 [<c0103b36>] ? kernel_thread_helper+0x6/0x30

need_stats_update should be zero-initialized.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Adam Litke <agl@us.ibm.com>
This commit is contained in:
Rusty Russell 2010-02-24 14:22:14 -06:00
parent 1f34c71afe
commit 169c246a30
1 changed files with 1 additions and 0 deletions
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1
drivers/virtio/virtio_balloon.c
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@ -292,6 +292,7 @@ static int virtballoon_probe(struct virtio_device *vdev)
vb->num_pages = 0;
init_waitqueue_head(&vb->config_change);
vb->vdev = vdev;
vb->need_stats_update = 0;
/* We expect two virtqueues: inflate and deflate,
* and optionally stat. */