From: Dexuan Cui decui@microsoft.com
[ Upstream commit 6d0d779dca73cd5acb649c54f81401f93098b298 ]
This fixes a warning of "suspicious rcu_dereference_check() usage" when nload runs.
Fixes: 776e726bfb34 ("netvsc: fix RCU warning in get_stats") Signed-off-by: Dexuan Cui decui@microsoft.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/hyperv/netvsc_drv.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 3544e19915792..e8fce6d715ef0 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -1239,12 +1239,15 @@ static void netvsc_get_stats64(struct net_device *net, struct rtnl_link_stats64 *t) { struct net_device_context *ndev_ctx = netdev_priv(net); - struct netvsc_device *nvdev = rcu_dereference_rtnl(ndev_ctx->nvdev); + struct netvsc_device *nvdev; struct netvsc_vf_pcpu_stats vf_tot; int i;
+ rcu_read_lock(); + + nvdev = rcu_dereference(ndev_ctx->nvdev); if (!nvdev) - return; + goto out;
netdev_stats_to_stats64(t, &net->stats);
@@ -1283,6 +1286,8 @@ static void netvsc_get_stats64(struct net_device *net, t->rx_packets += packets; t->multicast += multicast; } +out: + rcu_read_unlock(); }
static int netvsc_set_mac_addr(struct net_device *ndev, void *p)