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net: fix race condition in several drivers when reading stats

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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>
This commit is contained in:
Kevin Groeneveld
2012-07-21 06:30:50 +00:00
committed by David S. Miller
parent 0980e56e50
commit e3906486f6
5 changed files with 14 additions and 14 deletions
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4
net/bridge/br_device.c
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@@ -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;