linux-kernel - [PATCH v2 09/11] virtio: net: Add freeze, restore handlers to support S4

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Message-Id: <5b7834c9a30254220f9c079ba54d29abaf63db8f.1317311033.git.amit.shah@redhat.com>
Date:	Thu, 29 Sep 2011 21:19:40 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Amit Shah <amit.shah@...hat.com>
Subject: [PATCH v2 09/11] virtio: net: Add freeze, restore handlers to support S4

Remove all the vqs on hibernation and re-create them after restoring
from a hibernated image.  This keeps networking working across
hibernation.

Signed-off-by: Amit Shah <amit.shah@...hat.com>
---
 drivers/net/virtio_net.c |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index dcd4b01..8b9ed43 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1131,6 +1131,30 @@ static void __devexit virtnet_remove(struct virtio_device *vdev)
 	free_netdev(vi->dev);
 }
 
+#ifdef CONFIG_PM
+static int virtnet_freeze(struct virtio_device *vdev)
+{
+	struct virtnet_info *vi = vdev->priv;
+
+	remove_vq_common(vi);
+
+	return 0;
+}
+
+static int virtnet_restore(struct virtio_device *vdev)
+{
+	struct virtnet_info *vi = vdev->priv;
+	int err;
+
+	err = init_vqs(vi);
+	if (err)
+		return err;
+
+	try_fill_recv(vi, GFP_KERNEL);
+	return 0;
+}
+#endif
+
 static struct virtio_device_id id_table[] = {
 	{ VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
 	{ 0 },
@@ -1155,6 +1179,10 @@ static struct virtio_driver virtio_net_driver = {
 	.probe =	virtnet_probe,
 	.remove =	__devexit_p(virtnet_remove),
 	.config_changed = virtnet_config_changed,
+#ifdef CONFIG_PM
+	.freeze =	virtnet_freeze,
+	.restore =	virtnet_restore,
+#endif
 };
 
 static int __init init(void)
-- 
1.7.6.2

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