netvsc: add rcu_read locking to netvsc callback

The receive callback (in tasklet context) is using RCU to get reference
to associated VF network device but this is not safe. RCU read lock
needs to be held. Found by running with full lockdep debugging
enabled.

Fixes: f207c10d9823 ("hv_netvsc: use RCU to protect vf_netdev")
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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;
 }