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Commit b37bc05f authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Greg Kroah-Hartman
Browse files

hv_netvsc: fix locking for rx_mode 



[ Upstream commit 35a57b7fef136fa3d5b735ba773f191b95110fa0 ]

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: default avatarStephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarSasha Levin <alexander.levin@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9241c4f4

drivers/net/hyperv/netvsc_drv.c

+8 −3
Original line number Diff line number Diff line
@@ -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);

	}



	nvdev = rcu_dereference(ndev_ctx->nvdev);

	if (nvdev)

		rndis_filter_update(nvdev);

	rcu_read_unlock();

}



static int netvsc_open(struct net_device *net)