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tipc: advance the time of deleting subscription from subscriber->subscrp_list

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After a subscription object is created, it's inserted into its
subscriber subscrp_list list under subscriber lock protection,
similarly, before it's destroyed, it should be first removed from
its subscriber->subscrp_list. Since the subscription list is
accessed with subscriber lock, all the subscriptions are valid
during the lock duration. Hence in tipc_subscrb_subscrp_delete(), we
remove subscription get/put and the extra subscriber unlock/lock.

After this change, the subscriptions refcount cleanup is very simple
and does not access any lock.

Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ying Xue 2017-03-28 12:28:27 +02:00 committed by David S. Miller
parent 589a1a2e63
commit 139bb36f75
1 changed files with 2 additions and 7 deletions
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9
net/tipc/subscr.c
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@ -145,6 +145,7 @@ static void tipc_subscrp_timeout(unsigned long data)
spin_lock_bh(&subscriber->lock);
tipc_nametbl_unsubscribe(sub);
list_del(&sub->subscrp_list);
spin_unlock_bh(&subscriber->lock);
/* Notify subscriber of timeout */
@ -177,10 +178,7 @@ static void tipc_subscrp_kref_release(struct kref *kref)
struct tipc_net *tn = net_generic(sub->net, tipc_net_id);
struct tipc_subscriber *subscriber = sub->subscriber;
spin_lock_bh(&subscriber->lock);
list_del(&sub->subscrp_list);
atomic_dec(&tn->subscription_count);
spin_unlock_bh(&subscriber->lock);
kfree(sub);
tipc_subscrb_put(subscriber);
}
@ -210,11 +208,8 @@ static void tipc_subscrb_subscrp_delete(struct tipc_subscriber *subscriber,
continue;
tipc_nametbl_unsubscribe(sub);
tipc_subscrp_get(sub);
spin_unlock_bh(&subscriber->lock);
list_del(&sub->subscrp_list);
tipc_subscrp_delete(sub);
tipc_subscrp_put(sub);
spin_lock_bh(&subscriber->lock);
if (s)
break;