1 files changed, 30 insertions, 143 deletions

diff --git a/net/tipc/subscr.c b/net/tipc/subscr.c
index b86fbbf7a0b9..c6de1452db69 100644
--- a/net/tipc/subscr.c
+++ b/net/tipc/subscr.c
@@ -1,7 +1,7 @@
 /*
  * net/tipc/subscr.c: TIPC network topology service
  *
- * Copyright (c) 2000-2006, Ericsson AB
+ * Copyright (c) 2000-2017, Ericsson AB
  * Copyright (c) 2005-2007, 2010-2013, Wind River Systems
  * All rights reserved.
  *
@@ -39,22 +39,6 @@
 #include "subscr.h"
 
 /**
- * struct tipc_subscriber - TIPC network topology subscriber
- * @kref: reference counter to tipc_subscription object
- * @conid: connection identifier to server connecting to subscriber
- * @lock: control access to subscriber
- * @subscrp_list: list of subscription objects for this subscriber
- */
-struct tipc_subscriber {
-	struct kref kref;
-	int conid;
-	spinlock_t lock;
-	struct list_head subscrp_list;
-};
-
-static void tipc_subscrb_put(struct tipc_subscriber *subscriber);
-
-/**
  * htohl - convert value to endianness used by destination
  * @in: value to convert
  * @swap: non-zero if endianness must be reversed
@@ -71,9 +55,10 @@ static void tipc_subscrp_send_event(struct tipc_subscription *sub,
 				    u32 event, u32 port_ref, u32 node)
 {
 	struct tipc_net *tn = net_generic(sub->net, tipc_net_id);
-	struct tipc_subscriber *subscriber = sub->subscriber;
 	struct kvec msg_sect;
 
+	if (sub->inactive)
+		return;
 	msg_sect.iov_base = (void *)&sub->evt;
 	msg_sect.iov_len = sizeof(struct tipc_event);
 	sub->evt.event = htohl(event, sub->swap);
@@ -81,7 +66,7 @@ static void tipc_subscrp_send_event(struct tipc_subscription *sub,
 	sub->evt.found_upper = htohl(found_upper, sub->swap);
 	sub->evt.port.ref = htohl(port_ref, sub->swap);
 	sub->evt.port.node = htohl(node, sub->swap);
-	tipc_conn_sendmsg(tn->topsrv, subscriber->conid,
+	tipc_conn_sendmsg(tn->topsrv, sub->conid, event,
 			  msg_sect.iov_base, msg_sect.iov_len);
 }
 
@@ -132,41 +117,22 @@ void tipc_subscrp_report_overlap(struct tipc_subscription *sub, u32 found_lower,
 		return;
 	if (filter & TIPC_SUB_NODE_SCOPE && scope != TIPC_NODE_SCOPE)
 		return;
-
-	tipc_subscrp_send_event(sub, found_lower, found_upper, event, port_ref,
-				node);
+	spin_lock(&sub->lock);
+	tipc_subscrp_send_event(sub, found_lower, found_upper,
+				event, port_ref, node);
+	spin_unlock(&sub->lock);
 }
 
 static void tipc_subscrp_timeout(struct timer_list *t)
 {
 	struct tipc_subscription *sub = from_timer(sub, t, timer);
-	struct tipc_subscriber *subscriber = sub->subscriber;
-
-	spin_lock_bh(&subscriber->lock);
-	tipc_nametbl_unsubscribe(sub);
-	list_del(&sub->subscrp_list);
-	spin_unlock_bh(&subscriber->lock);
+	struct tipc_subscr *s = &sub->evt.s;
 
-	/* Notify subscriber of timeout */
-	tipc_subscrp_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper,
+	spin_lock(&sub->lock);
+	tipc_subscrp_send_event(sub, s->seq.lower, s->seq.upper,
 				TIPC_SUBSCR_TIMEOUT, 0, 0);
-
-	tipc_subscrp_put(sub);
-}
-
-static void tipc_subscrb_kref_release(struct kref *kref)
-{
-	kfree(container_of(kref,struct tipc_subscriber, kref));
-}
-
-static void tipc_subscrb_put(struct tipc_subscriber *subscriber)
-{
-	kref_put(&subscriber->kref, tipc_subscrb_kref_release);
-}
-
-static void tipc_subscrb_get(struct tipc_subscriber *subscriber)
-{
-	kref_get(&subscriber->kref);
+	sub->inactive = true;
+	spin_unlock(&sub->lock);
 }
 
 static void tipc_subscrp_kref_release(struct kref *kref)
@@ -175,11 +141,9 @@ static void tipc_subscrp_kref_release(struct kref *kref)
 						     struct tipc_subscription,
 						     kref);
 	struct tipc_net *tn = net_generic(sub->net, tipc_net_id);
-	struct tipc_subscriber *subscriber = sub->subscriber;
 
 	atomic_dec(&tn->subscription_count);
 	kfree(sub);
-	tipc_subscrb_put(subscriber);
 }
 
 void tipc_subscrp_put(struct tipc_subscription *subscription)
@@ -192,68 +156,9 @@ void tipc_subscrp_get(struct tipc_subscription *subscription)
 	kref_get(&subscription->kref);
 }
 
-/* tipc_subscrb_subscrp_delete - delete a specific subscription or all
- * subscriptions for a given subscriber.
- */
-static void tipc_subscrb_subscrp_delete(struct tipc_subscriber *subscriber,
-					struct tipc_subscr *s)
-{
-	struct list_head *subscription_list = &subscriber->subscrp_list;
-	struct tipc_subscription *sub, *temp;
-	u32 timeout;
-
-	spin_lock_bh(&subscriber->lock);
-	list_for_each_entry_safe(sub, temp, subscription_list,  subscrp_list) {
-		if (s && memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr)))
-			continue;
-
-		timeout = htohl(sub->evt.s.timeout, sub->swap);
-		if (timeout == TIPC_WAIT_FOREVER || del_timer(&sub->timer)) {
-			tipc_nametbl_unsubscribe(sub);
-			list_del(&sub->subscrp_list);
-			tipc_subscrp_put(sub);
-		}
-
-		if (s)
-			break;
-	}
-	spin_unlock_bh(&subscriber->lock);
-}
-
-struct tipc_subscriber *tipc_subscrb_create(int conid)
-{
-	struct tipc_subscriber *subscriber;
-
-	subscriber = kzalloc(sizeof(*subscriber), GFP_ATOMIC);
-	if (!subscriber) {
-		pr_warn("Subscriber rejected, no memory\n");
-		return NULL;
-	}
-	INIT_LIST_HEAD(&subscriber->subscrp_list);
-	kref_init(&subscriber->kref);
-	subscriber->conid = conid;
-	spin_lock_init(&subscriber->lock);
-
-	return subscriber;
-}
-
-void tipc_subscrb_delete(struct tipc_subscriber *subscriber)
-{
-	tipc_subscrb_subscrp_delete(subscriber, NULL);
-	tipc_subscrb_put(subscriber);
-}
-
-static void tipc_subscrp_cancel(struct tipc_subscr *s,
-				struct tipc_subscriber *subscriber)
-{
-	tipc_subscrb_get(subscriber);
-	tipc_subscrb_subscrp_delete(subscriber, s);
-	tipc_subscrb_put(subscriber);
-}
-
 static struct tipc_subscription *tipc_subscrp_create(struct net *net,
 						     struct tipc_subscr *s,
-						     int swap)
+						     int conid, bool swap)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 	struct tipc_subscription *sub;
@@ -275,6 +180,8 @@ static struct tipc_subscription *tipc_subscrp_create(struct net *net,
 
 	/* Initialize subscription object */
 	sub->net = net;
+	sub->conid = conid;
+	sub->inactive = false;
 	if (((filter & TIPC_SUB_PORTS) && (filter & TIPC_SUB_SERVICE)) ||
 	    (htohl(s->seq.lower, swap) > htohl(s->seq.upper, swap))) {
 		pr_warn("Subscription rejected, illegal request\n");
@@ -284,59 +191,39 @@ static struct tipc_subscription *tipc_subscrp_create(struct net *net,
 
 	sub->swap = swap;
 	memcpy(&sub->evt.s, s, sizeof(*s));
+	spin_lock_init(&sub->lock);
 	atomic_inc(&tn->subscription_count);
 	kref_init(&sub->kref);
 	return sub;
 }
 
-static int tipc_subscrp_subscribe(struct net *net, struct tipc_subscr *s,
-				  struct tipc_subscriber *subscriber, int swap,
-				  bool status)
+struct tipc_subscription *tipc_subscrp_subscribe(struct net *net,
+						 struct tipc_subscr *s,
+						 int conid, bool swap,
+						 bool status)
 {
 	struct tipc_subscription *sub = NULL;
 	u32 timeout;
 
-	sub = tipc_subscrp_create(net, s, swap);
+	sub = tipc_subscrp_create(net, s, conid, swap);
 	if (!sub)
-		return -1;
+		return NULL;
 
-	spin_lock_bh(&subscriber->lock);
-	list_add(&sub->subscrp_list, &subscriber->subscrp_list);
-	sub->subscriber = subscriber;
 	tipc_nametbl_subscribe(sub, status);
-	tipc_subscrb_get(subscriber);
-	spin_unlock_bh(&subscriber->lock);
-
 	timer_setup(&sub->timer, tipc_subscrp_timeout, 0);
 	timeout = htohl(sub->evt.s.timeout, swap);
-
 	if (timeout != TIPC_WAIT_FOREVER)
 		mod_timer(&sub->timer, jiffies + msecs_to_jiffies(timeout));
-	return 0;
+	return sub;
 }
 
-/* Handle one request to create a new subscription for the subscriber
- */
-int tipc_subscrb_rcv(struct net *net, int conid, void *usr_data,
-		     void *buf, size_t len)
+void tipc_sub_delete(struct tipc_subscription *sub)
 {
-	struct tipc_subscriber *subscriber = usr_data;
-	struct tipc_subscr *s = (struct tipc_subscr *)buf;
-	bool status;
-	int swap;
-
-	/* Determine subscriber's endianness */
-	swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE |
-			      TIPC_SUB_CANCEL));
-
-	/* Detect & process a subscription cancellation request */
-	if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) {
-		s->filter &= ~htohl(TIPC_SUB_CANCEL, swap);
-		tipc_subscrp_cancel(s, subscriber);
-		return 0;
-	}
-	status = !(s->filter & htohl(TIPC_SUB_NO_STATUS, swap));
-	return tipc_subscrp_subscribe(net, s, subscriber, swap, status);
+	tipc_nametbl_unsubscribe(sub);
+	if (sub->evt.s.timeout != TIPC_WAIT_FOREVER)
+		del_timer_sync(&sub->timer);
+	list_del(&sub->subscrp_list);
+	tipc_subscrp_put(sub);
 }
 
 int tipc_topsrv_start(struct net *net)