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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-02-22 17:04:49 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-02-25 09:41:03 +0100 |
| commit | a898def29e4119bc01ebe7ca97423181f4c0ea2d (patch) | |
| tree | e6f89d4f4a91fd24507ad600ebb9ad620ec9d9a8 /net/core/rtnetlink.c | |
| parent | 3120438ad68601f341e61e7cb1323b0e1a6ca367 (diff) | |
| download | linux-a898def29e4119bc01ebe7ca97423181f4c0ea2d.tar.bz2 | |
net: Add checking to rcu_dereference() primitives
Update rcu_dereference() primitives to use new lockdep-based
checking. The rcu_dereference() in __in6_dev_get() may be
protected either by rcu_read_lock() or RTNL, per Eric Dumazet.
The rcu_dereference() in __sk_free() is protected by the fact
that it is never reached if an update could change it. Check
for this by using rcu_dereference_check() to verify that the
struct sock's ->sk_wmem_alloc counter is zero.
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <1266887105-1528-5-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'net/core/rtnetlink.c')
| -rw-r--r-- | net/core/rtnetlink.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 794bcb897ff0..4c7d3f635ba7 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -89,6 +89,14 @@ int rtnl_is_locked(void) } EXPORT_SYMBOL(rtnl_is_locked); +#ifdef CONFIG_PROVE_LOCKING +int lockdep_rtnl_is_held(void) +{ + return lockdep_is_held(&rtnl_mutex); +} +EXPORT_SYMBOL(lockdep_rtnl_is_held); +#endif /* #ifdef CONFIG_PROVE_LOCKING */ + static struct rtnl_link *rtnl_msg_handlers[NPROTO]; static inline int rtm_msgindex(int msgtype) |