From e3906486f616da7cc086a3ba06c0df4e5a48b4ab Mon Sep 17 00:00:00 2001 From: Kevin Groeneveld Date: Sat, 21 Jul 2012 06:30:50 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- drivers/net/dummy.c | 4 ++-- drivers/net/ethernet/neterion/vxge/vxge-main.c | 8 ++++---- drivers/net/loopback.c | 4 ++-- drivers/net/virtio_net.c | 8 ++++---- net/bridge/br_device.c | 4 ++-- 5 files changed, 14 insertions(+), 14 deletions(-) diff --git a/drivers/net/dummy.c b/drivers/net/dummy.c index 9d6a0677466b..c260af5411d0 100644 --- a/drivers/net/dummy.c +++ b/drivers/net/dummy.c @@ -63,10 +63,10 @@ static struct rtnl_link_stats64 *dummy_get_stats64(struct net_device *dev, dstats = per_cpu_ptr(dev->dstats, i); do { - start = u64_stats_fetch_begin(&dstats->syncp); + start = u64_stats_fetch_begin_bh(&dstats->syncp); tbytes = dstats->tx_bytes; tpackets = dstats->tx_packets; - } while (u64_stats_fetch_retry(&dstats->syncp, start)); + } while (u64_stats_fetch_retry_bh(&dstats->syncp, start)); stats->tx_bytes += tbytes; stats->tx_packets += tpackets; } diff --git a/drivers/net/ethernet/neterion/vxge/vxge-main.c b/drivers/net/ethernet/neterion/vxge/vxge-main.c index 4e20c5f02712..de2190443510 100644 --- a/drivers/net/ethernet/neterion/vxge/vxge-main.c +++ b/drivers/net/ethernet/neterion/vxge/vxge-main.c @@ -3131,12 +3131,12 @@ vxge_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *net_stats) u64 packets, bytes, multicast; do { - start = u64_stats_fetch_begin(&rxstats->syncp); + start = u64_stats_fetch_begin_bh(&rxstats->syncp); packets = rxstats->rx_frms; multicast = rxstats->rx_mcast; bytes = rxstats->rx_bytes; - } while (u64_stats_fetch_retry(&rxstats->syncp, start)); + } while (u64_stats_fetch_retry_bh(&rxstats->syncp, start)); net_stats->rx_packets += packets; net_stats->rx_bytes += bytes; @@ -3146,11 +3146,11 @@ vxge_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *net_stats) net_stats->rx_dropped += rxstats->rx_dropped; do { - start = u64_stats_fetch_begin(&txstats->syncp); + start = u64_stats_fetch_begin_bh(&txstats->syncp); packets = txstats->tx_frms; bytes = txstats->tx_bytes; - } while (u64_stats_fetch_retry(&txstats->syncp, start)); + } while (u64_stats_fetch_retry_bh(&txstats->syncp, start)); net_stats->tx_packets += packets; net_stats->tx_bytes += bytes; diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c index 32eb94ece6c1..e2a06fd996d5 100644 --- a/drivers/net/loopback.c +++ b/drivers/net/loopback.c @@ -107,10 +107,10 @@ static struct rtnl_link_stats64 *loopback_get_stats64(struct net_device *dev, lb_stats = per_cpu_ptr(dev->lstats, i); do { - start = u64_stats_fetch_begin(&lb_stats->syncp); + start = u64_stats_fetch_begin_bh(&lb_stats->syncp); tbytes = lb_stats->bytes; tpackets = lb_stats->packets; - } while (u64_stats_fetch_retry(&lb_stats->syncp, start)); + } while (u64_stats_fetch_retry_bh(&lb_stats->syncp, start)); bytes += tbytes; packets += tpackets; } 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; diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c index f4be1bbfef26..333484537600 100644 --- a/net/bridge/br_device.c +++ b/net/bridge/br_device.c @@ -127,9 +127,9 @@ static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev, const struct br_cpu_netstats *bstats = per_cpu_ptr(br->stats, cpu); do { - start = u64_stats_fetch_begin(&bstats->syncp); + start = u64_stats_fetch_begin_bh(&bstats->syncp); memcpy(&tmp, bstats, sizeof(tmp)); - } while (u64_stats_fetch_retry(&bstats->syncp, start)); + } while (u64_stats_fetch_retry_bh(&bstats->syncp, start)); sum.tx_bytes += tmp.tx_bytes; sum.tx_packets += tmp.tx_packets; sum.rx_bytes += tmp.rx_bytes; -- 2.30.2