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xen-netback: protect resource cleaning on XenBus disconnect 

vif->lock is used to protect statistics gathering agents from using the
queue structure during cleaning.

Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Igor Druzhinin 2017-01-17 20:49:38 +00:00 committed by David S. Miller
parent 9a6cdf52b8
commit f16f1df65f
2 changed files with 6 additions and 2 deletions
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6
drivers/net/xen-netback/interface.c
View File

@ -221,18 +221,18 @@ static struct net_device_stats *xenvif_get_stats(struct net_device *dev)
{
struct xenvif *vif = netdev_priv(dev);
struct xenvif_queue *queue = NULL;
unsigned int num_queues = vif->num_queues;
unsigned long rx_bytes = 0;
unsigned long rx_packets = 0;
unsigned long tx_bytes = 0;
unsigned long tx_packets = 0;
unsigned int index;
spin_lock(&vif->lock);
if (vif->queues == NULL)
goto out;
/* Aggregate tx and rx stats from each queue */
for (index = 0; index < num_queues; ++index) {
for (index = 0; index < vif->num_queues; ++index) {
queue = &vif->queues[index];
rx_bytes += queue->stats.rx_bytes;
rx_packets += queue->stats.rx_packets;
@ -241,6 +241,8 @@ static struct net_device_stats *xenvif_get_stats(struct net_device *dev)
}
out:
spin_unlock(&vif->lock);
vif->dev->stats.rx_bytes = rx_bytes;
vif->dev->stats.rx_packets = rx_packets;
vif->dev->stats.tx_bytes = tx_bytes;

2
drivers/net/xen-netback/xenbus.c
View File

@ -503,9 +503,11 @@ static void backend_disconnect(struct backend_info *be)
for (queue_index = 0; queue_index < be->vif->num_queues; ++queue_index)
xenvif_deinit_queue(&be->vif->queues[queue_index]);
spin_lock(&be->vif->lock);
vfree(be->vif->queues);
be->vif->num_queues = 0;
be->vif->queues = NULL;
spin_unlock(&be->vif->lock);
xenvif_disconnect_ctrl(be->vif);
}