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authorEric Dumazet <eric.dumazet@gmail.com>2010-06-09 02:09:23 +0000
committerDavid S. Miller <davem@davemloft.net>2010-06-11 18:37:08 -0700
commitc7de2cf053420d63bac85133469c965d4b1083e1 (patch)
treeb56f7c96d01e25f79fe1f9b7e5305265e92214d9 /net/core/gen_estimator.c
parentcbd6890c5987cd7115147e1dd2c10d729afabb08 (diff)
pkt_sched: gen_kill_estimator() rcu fixes
gen_kill_estimator() API is incomplete or not well documented, since caller should make sure an RCU grace period is respected before freeing stats_lock. This was partially addressed in commit 5d944c640b4 (gen_estimator: deadlock fix), but same problem exist for all gen_kill_estimator() users, if lock they use is not already RCU protected. A code review shows xt_RATEEST.c, act_api.c, act_police.c have this problem. Other are ok because they use qdisc lock, already RCU protected. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/gen_estimator.c')
-rw-r--r--net/core/gen_estimator.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/core/gen_estimator.c b/net/core/gen_estimator.c
index 785e5276a300..9fbe7f7429b0 100644
--- a/net/core/gen_estimator.c
+++ b/net/core/gen_estimator.c
@@ -263,6 +263,7 @@ static void __gen_kill_estimator(struct rcu_head *head)
*
* Removes the rate estimator specified by &bstats and &rate_est.
*
+ * Note : Caller should respect an RCU grace period before freeing stats_lock
*/
void gen_kill_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_rate_est *rate_est)