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authorEric Dumazet <edumazet@google.com>2016-03-18 03:23:36 +0300
committerDavid S. Miller <davem@davemloft.net>2016-03-19 06:14:15 +0300
commitfe30937b65354c7fec244caebbdaae68e28ca797 (patch)
tree76597e789e2eac26153f116c8dfe991f934bc96a /include/net
parenteee577232203842b4dcadb7ab477a298479633ed (diff)
downloadlinux-fe30937b65354c7fec244caebbdaae68e28ca797.tar.xz
bonding: fix bond_get_stats()
bond_get_stats() can be called from rtnetlink (with RTNL held) or from /proc/net/dev seq handler (with RCU held) The logic added in commit 5f0c5f73e5ef ("bonding: make global bonding stats more reliable") kind of assumed only one cpu could run there. If multiple threads are reading /proc/net/dev, stats can be really messed up after a while. A second problem is that some fields are 32bit, so we need to properly handle the wrap around problem. Given that RTNL is not always held, we need to use bond_for_each_slave_rcu(). Fixes: 5f0c5f73e5ef ("bonding: make global bonding stats more reliable") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Andy Gospodarek <gospo@cumulusnetworks.com> Cc: Jay Vosburgh <j.vosburgh@gmail.com> Cc: Veaceslav Falico <vfalico@gmail.com> Reviewed-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/bonding.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/bonding.h b/include/net/bonding.h
index ee6c52053aa3..791800ddd6d9 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -215,6 +215,7 @@ struct bonding {
* ALB mode (6) - to sync the use and modifications of its hash table
*/
spinlock_t mode_lock;
+ spinlock_t stats_lock;
u8 send_peer_notif;
u8 igmp_retrans;
#ifdef CONFIG_PROC_FS