netvsc: add rcu_read locking to netvsc callback

[linux.git] / drivers / net / hyperv / netvsc_drv.c

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index c9414c0548526657e78f77eb792f14df278eb376..fcab8019dda08ad430d126f9f044f39291a7a154 100644 (file)
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -659,6 +659,7 @@ int netvsc_recv_callback(struct hv_device *device_obj,
         * policy filters on the host). Deliver these via the VF
         * interface in the guest.
         */
+       rcu_read_lock();
        vf_netdev = rcu_dereference(net_device_ctx->vf_netdev);
        if (vf_netdev && (vf_netdev->flags & IFF_UP))
                net = vf_netdev;
@@ -667,6 +668,7 @@ int netvsc_recv_callback(struct hv_device *device_obj,
        skb = netvsc_alloc_recv_skb(net, packet, csum_info, *data, vlan_tci);
        if (unlikely(!skb)) {
                ++net->stats.rx_dropped;
+               rcu_read_unlock();
                return NVSP_STAT_FAIL;
        }
 
@@ -696,6 +698,7 @@ int netvsc_recv_callback(struct hv_device *device_obj,
         * TODO - use NAPI?
         */
        netif_rx(skb);
+       rcu_read_unlock();
 
        return 0;
 }