linux-kernel - [RFC PATCH 07/15] virtio-net: Handle virtio_device

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Date:   Mon, 17 May 2021 17:34:21 +0800
From:   Xie Yongji <xieyongji@...edance.com>
To:     mst@...hat.com, jasowang@...hat.com, stefanha@...hat.com
Cc:     amit@...nel.org, arei.gonglei@...wei.com, airlied@...ux.ie,
        kraxel@...hat.com, jean-philippe@...aro.org, ohad@...ery.com,
        bjorn.andersson@...aro.org, david@...hat.com, vgoyal@...hat.com,
        miklos@...redi.hu, lucho@...kov.net, asmadeus@...ewreck.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 07/15] virtio-net: Handle virtio_device_ready() failure

Now virtio_device_ready() will return error if we get
invalid status. Let's handle this case in both probe
and resume paths.

Signed-off-by: Xie Yongji <xieyongji@...edance.com>
---
 drivers/net/virtio_net.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 01e54e99cae6..c4711e23af88 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2341,6 +2341,7 @@ static void virtnet_freeze_down(struct virtio_device *vdev)
 }
 
 static int init_vqs(struct virtnet_info *vi);
+static void virtnet_del_vqs(struct virtnet_info *vi);
 
 static int virtnet_restore_up(struct virtio_device *vdev)
 {
@@ -2351,7 +2352,11 @@ static int virtnet_restore_up(struct virtio_device *vdev)
 	if (err)
 		return err;
 
-	virtio_device_ready(vdev);
+	err = virtio_device_ready(vdev);
+	if (err) {
+		virtnet_del_vqs(vi);
+		return err;
+	}
 
 	if (netif_running(vi->dev)) {
 		for (i = 0; i < vi->curr_queue_pairs; i++)
@@ -3148,12 +3153,16 @@ static int virtnet_probe(struct virtio_device *vdev)
 		goto free_failover;
 	}
 
-	virtio_device_ready(vdev);
+	err = virtio_device_ready(vdev);
+	if (err) {
+		pr_debug("virtio_net: enable virtio device failed\n");
+		goto free_unregister_netdev;
+	}
 
 	err = virtnet_cpu_notif_add(vi);
 	if (err) {
 		pr_debug("virtio_net: registering cpu notifier failed\n");
-		goto free_unregister_netdev;
+		goto reset_virtio_device;
 	}
 
 	virtnet_set_queues(vi, vi->curr_queue_pairs);
@@ -3179,9 +3188,9 @@ static int virtnet_probe(struct virtio_device *vdev)
 
 	return 0;
 
-free_unregister_netdev:
+reset_virtio_device:
 	vi->vdev->config->reset(vdev);
-
+free_unregister_netdev:
 	unregister_netdev(dev);
 free_failover:
 	net_failover_destroy(vi->failover);
-- 
2.11.0