diff options
| author | Stephen Hemminger <stephen@networkplumber.org> | 2018-03-08 00:49:11 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-03-08 20:48:56 +0300 |
| commit | 35a57b7fef136fa3d5b735ba773f191b95110fa0 (patch) | |
| tree | e9660042bfba78f46327d71fe215a0fb5fbab8c6 /drivers/net/hyperv/netvsc_drv.c | |
| parent | 7eeb4a6ee4820c4e84895d252079a797f27fc80d (diff) | |
| download | linux-35a57b7fef136fa3d5b735ba773f191b95110fa0.tar.xz | |
hv_netvsc: fix locking for rx_mode
The rx_mode operation handler is different than other callbacks
in that is not always called with rtnl held. Therefore use
RCU to ensure that references are valid.
Fixes: bee9d41b37ea ("hv_netvsc: propagate rx filters to VF")
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/hyperv/netvsc_drv.c')
| -rw-r--r-- | drivers/net/hyperv/netvsc_drv.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index cdb78eefab67..48d9fa7a66c2 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -89,15 +89,20 @@ static void netvsc_change_rx_flags(struct net_device *net, int change) static void netvsc_set_rx_mode(struct net_device *net) { struct net_device_context *ndev_ctx = netdev_priv(net); - struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev); - struct netvsc_device *nvdev = rtnl_dereference(ndev_ctx->nvdev); + struct net_device *vf_netdev; + struct netvsc_device *nvdev; + rcu_read_lock(); + vf_netdev = rcu_dereference(ndev_ctx->vf_netdev); if (vf_netdev) { dev_uc_sync(vf_netdev, net); dev_mc_sync(vf_netdev, net); } - rndis_filter_update(nvdev); + nvdev = rcu_dereference(ndev_ctx->nvdev); + if (nvdev) + rndis_filter_update(nvdev); + rcu_read_unlock(); } static int netvsc_open(struct net_device *net) |