diff options
Diffstat (limited to 'net/core/gen_estimator.c')
| -rw-r--r-- | net/core/gen_estimator.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/net/core/gen_estimator.c b/net/core/gen_estimator.c index a89f32fa94f6..57abe8266be1 100644 --- a/net/core/gen_estimator.c +++ b/net/core/gen_estimator.c @@ -99,7 +99,7 @@ struct gen_estimator_head static struct gen_estimator_head elist[EST_MAX_INTERVAL+1]; -/* Protects against NULL dereference and RCU write-side */ +/* Protects against NULL dereference */ static DEFINE_RWLOCK(est_lock); static void est_timer(unsigned long arg) @@ -185,7 +185,6 @@ int gen_new_estimator(struct gnet_stats_basic *bstats, est->last_packets = bstats->packets; est->avpps = rate_est->pps<<10; - write_lock_bh(&est_lock); if (!elist[idx].timer.function) { INIT_LIST_HEAD(&elist[idx].list); setup_timer(&elist[idx].timer, est_timer, idx); @@ -195,7 +194,6 @@ int gen_new_estimator(struct gnet_stats_basic *bstats, mod_timer(&elist[idx].timer, jiffies + ((HZ/4) << idx)); list_add_rcu(&est->list, &elist[idx].list); - write_unlock_bh(&est_lock); return 0; } @@ -214,6 +212,7 @@ static void __gen_kill_estimator(struct rcu_head *head) * Removes the rate estimator specified by &bstats and &rate_est * and deletes the timer. * + * NOTE: Called under rtnl_mutex */ void gen_kill_estimator(struct gnet_stats_basic *bstats, struct gnet_stats_rate_est *rate_est) @@ -227,17 +226,17 @@ void gen_kill_estimator(struct gnet_stats_basic *bstats, if (!elist[idx].timer.function) continue; - write_lock_bh(&est_lock); list_for_each_entry_safe(e, n, &elist[idx].list, list) { if (e->rate_est != rate_est || e->bstats != bstats) continue; + write_lock_bh(&est_lock); e->bstats = NULL; + write_unlock_bh(&est_lock); list_del_rcu(&e->list); call_rcu(&e->e_rcu, __gen_kill_estimator); } - write_unlock_bh(&est_lock); } } |