Commit d4766692 authored by Jarek Poplawski's avatar Jarek Poplawski Committed by David S. Miller

pkt_sched: Protect gen estimators under est_lock.

gen_kill_estimator() required rtnl_lock() protection, but since it is
moved to an RCU callback __qdisc_destroy() let's use est_lock instead.
Signed-off-by: default avatarJarek Poplawski <jarkao2@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b9a3b110
......@@ -99,7 +99,7 @@ struct gen_estimator_head
static struct gen_estimator_head elist[EST_MAX_INTERVAL+1];
/* Protects against NULL dereference */
/* Protects against NULL dereference and RCU write-side */
static DEFINE_RWLOCK(est_lock);
static void est_timer(unsigned long arg)
......@@ -185,6 +185,7 @@ 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);
......@@ -194,6 +195,7 @@ 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;
}
......@@ -212,7 +214,6 @@ 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)
......@@ -226,17 +227,17 @@ 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);
}
}
......
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