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path: root/drivers/net/xen-netfront.c
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Diffstat (limited to 'drivers/net/xen-netfront.c')
-rw-r--r--drivers/net/xen-netfront.c46
1 files changed, 24 insertions, 22 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 9bd7ddeeb6a5..8328d395e332 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -351,6 +351,9 @@ static int xennet_open(struct net_device *dev)
unsigned int i = 0;
struct netfront_queue *queue = NULL;
+ if (!np->queues)
+ return -ENODEV;
+
for (i = 0; i < num_queues; ++i) {
queue = &np->queues[i];
napi_enable(&queue->napi);
@@ -1358,18 +1361,8 @@ static int netfront_probe(struct xenbus_device *dev,
#ifdef CONFIG_SYSFS
info->netdev->sysfs_groups[0] = &xennet_dev_group;
#endif
- err = register_netdev(info->netdev);
- if (err) {
- pr_warn("%s: register_netdev err=%d\n", __func__, err);
- goto fail;
- }
return 0;
-
- fail:
- xennet_free_netdev(netdev);
- dev_set_drvdata(&dev->dev, NULL);
- return err;
}
static void xennet_end_access(int ref, void *page)
@@ -1737,8 +1730,6 @@ static void xennet_destroy_queues(struct netfront_info *info)
{
unsigned int i;
- rtnl_lock();
-
for (i = 0; i < info->netdev->real_num_tx_queues; i++) {
struct netfront_queue *queue = &info->queues[i];
@@ -1747,8 +1738,6 @@ static void xennet_destroy_queues(struct netfront_info *info)
netif_napi_del(&queue->napi);
}
- rtnl_unlock();
-
kfree(info->queues);
info->queues = NULL;
}
@@ -1764,8 +1753,6 @@ static int xennet_create_queues(struct netfront_info *info,
if (!info->queues)
return -ENOMEM;
- rtnl_lock();
-
for (i = 0; i < *num_queues; i++) {
struct netfront_queue *queue = &info->queues[i];
@@ -1774,7 +1761,7 @@ static int xennet_create_queues(struct netfront_info *info,
ret = xennet_init_queue(queue);
if (ret < 0) {
- dev_warn(&info->netdev->dev,
+ dev_warn(&info->xbdev->dev,
"only created %d queues\n", i);
*num_queues = i;
break;
@@ -1788,10 +1775,8 @@ static int xennet_create_queues(struct netfront_info *info,
netif_set_real_num_tx_queues(info->netdev, *num_queues);
- rtnl_unlock();
-
if (*num_queues == 0) {
- dev_err(&info->netdev->dev, "no queues\n");
+ dev_err(&info->xbdev->dev, "no queues\n");
return -EINVAL;
}
return 0;
@@ -1828,6 +1813,7 @@ static int talk_to_netback(struct xenbus_device *dev,
goto out;
}
+ rtnl_lock();
if (info->queues)
xennet_destroy_queues(info);
@@ -1838,6 +1824,7 @@ static int talk_to_netback(struct xenbus_device *dev,
info->queues = NULL;
goto out;
}
+ rtnl_unlock();
/* Create shared ring, alloc event channel -- for each queue */
for (i = 0; i < num_queues; ++i) {
@@ -1934,8 +1921,10 @@ abort_transaction_no_dev_fatal:
xenbus_transaction_end(xbt, 1);
destroy_ring:
xennet_disconnect_backend(info);
+ rtnl_lock();
xennet_destroy_queues(info);
out:
+ rtnl_unlock();
device_unregister(&dev->dev);
return err;
}
@@ -1965,6 +1954,15 @@ static int xennet_connect(struct net_device *dev)
netdev_update_features(dev);
rtnl_unlock();
+ if (dev->reg_state == NETREG_UNINITIALIZED) {
+ err = register_netdev(dev);
+ if (err) {
+ pr_warn("%s: register_netdev err=%d\n", __func__, err);
+ device_unregister(&np->xbdev->dev);
+ return err;
+ }
+ }
+
/*
* All public and private state should now be sane. Get
* ready to start sending and receiving packets and give the driver
@@ -2150,10 +2148,14 @@ static int xennet_remove(struct xenbus_device *dev)
xennet_disconnect_backend(info);
- unregister_netdev(info->netdev);
+ if (info->netdev->reg_state == NETREG_REGISTERED)
+ unregister_netdev(info->netdev);
- if (info->queues)
+ if (info->queues) {
+ rtnl_lock();
xennet_destroy_queues(info);
+ rtnl_unlock();
+ }
xennet_free_netdev(info->netdev);
return 0;

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