net: fix race condition in several drivers when reading stats

Fix race condition in several network drivers when reading stats on 32bit
UP architectures.  These drivers update their stats in a BH context and
therefore should use u64_stats_fetch_begin_bh/u64_stats_fetch_retry_bh
instead of u64_stats_fetch_begin/u64_stats_fetch_retry when reading the
stats.

Signed-off-by: Kevin Groeneveld <kgroeneveld@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 1db445b2ecc7..83d2b0c34c5e 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -704,16 +704,16 @@ static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
                 u64 tpackets, tbytes, rpackets, rbytes;
 
                 do {
-                        start = u64_stats_fetch_begin(&stats->tx_syncp);
+                        start = u64_stats_fetch_begin_bh(&stats->tx_syncp);
                         tpackets = stats->tx_packets;
                         tbytes   = stats->tx_bytes;
-                } while (u64_stats_fetch_retry(&stats->tx_syncp, start));
+                } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start));
 
                 do {
-                        start = u64_stats_fetch_begin(&stats->rx_syncp);
+                        start = u64_stats_fetch_begin_bh(&stats->rx_syncp);
                         rpackets = stats->rx_packets;
                         rbytes   = stats->rx_bytes;
-                } while (u64_stats_fetch_retry(&stats->rx_syncp, start));
+                } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start));
 
                 tot->rx_packets += rpackets;
                 tot->tx_packets += tpackets;