linux-kernel - [PATCH v3 11/11] virtio: balloon: Add freeze, restore handlers to support S4

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Date:	Thu, 17 Nov 2011 17:27:42 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Virtualization List <virtualization@...ts.linux-foundation.org>,
	"Michael S. Tsirkin" <mst@...hat.com>, levinsasha928@...il.com,
	linux-kernel@...r.kernel.org, Amit Shah <amit.shah@...hat.com>
Subject: [PATCH v3 11/11] virtio: balloon: Add freeze, restore handlers to support S4

Delete the vqs on the freeze callback to prepare for hibernation.
Re-create the vqs in the restore callback to resume normal function.

Signed-off-by: Amit Shah <amit.shah@...hat.com>
---
 drivers/virtio/virtio_balloon.c |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 1ff3cf4..90149d1 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -363,6 +363,22 @@ static void __devexit virtballoon_remove(struct virtio_device *vdev)
 	kfree(vb);
 }
 
+#ifdef CONFIG_PM
+static int virtballoon_freeze(struct virtio_device *vdev)
+{
+	/* Now we reset the device so we can clean up the queues. */
+	vdev->config->reset(vdev);
+
+	vdev->config->del_vqs(vdev);
+	return 0;
+}
+
+static int virtballoon_restore(struct virtio_device *vdev)
+{
+	return init_vqs(vdev->priv);
+}
+#endif
+
 static unsigned int features[] = {
 	VIRTIO_BALLOON_F_MUST_TELL_HOST,
 	VIRTIO_BALLOON_F_STATS_VQ,
@@ -377,6 +393,10 @@ static struct virtio_driver virtio_balloon_driver = {
 	.probe =	virtballoon_probe,
 	.remove =	__devexit_p(virtballoon_remove),
 	.config_changed = virtballoon_changed,
+#ifdef CONFIG_PM
+	.freeze	=	virtballoon_freeze,
+	.restore =	virtballoon_restore,
+#endif
 };
 
 static int __init init(void)
-- 
1.7.7.1

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