In this commit, we split tipc_subscrp_create() into two:
1. tipc_subscrp_create() creates a subscription
2. A new function tipc_subscrp_subscribe() adds the
subscription to the subscriber subscription list,
activates the subscription timer and subscribes to
the nametable updates.
In future commits, the purpose of tipc_subscrb_rcv_cb() will
be to either subscribe or cancel a subscription.
There is no functional change in this commit.
Acked-by: Ying Xue <ying....@windriver.com>
Reviewed-by: Jon Maloy <jon.ma...@ericsson.com>
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvara...@ericsson.com>
---
net/tipc/subscr.c | 55 +++++++++++++++++++++++++++++++------------------------
1 file changed, 31 insertions(+), 24 deletions(-)
diff --git a/net/tipc/subscr.c b/net/tipc/subscr.c
index 702a81d8dbb6..022a2f21be04 100644
--- a/net/tipc/subscr.c
+++ b/net/tipc/subscr.c
@@ -233,13 +233,13 @@ static void tipc_subscrp_cancel(struct tipc_subscr *s,
spin_unlock_bh(&subscriber->lock);
}
-static int tipc_subscrp_create(struct net *net, struct tipc_subscr *s,
- struct tipc_subscriber *subscriber,
- struct tipc_subscription **sub_p)
+static struct tipc_subscription *tipc_subscrp_create(struct net *net,
+ struct tipc_subscr *s,
+ struct tipc_subscriber
*subscriber)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_subscription *sub;
- u32 timeout, filter;
+ u32 filter;
int swap;
/* Determine subscriber's endianness */
@@ -249,21 +249,21 @@ static int tipc_subscrp_create(struct net *net, struct
tipc_subscr *s,
if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) {
s->filter &= ~htohl(TIPC_SUB_CANCEL, swap);
tipc_subscrp_cancel(s, subscriber);
- return 0;
+ return NULL;
}
/* Refuse subscription if global limit exceeded */
if (atomic_read(&tn->subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) {
pr_warn("Subscription rejected, limit reached (%u)\n",
TIPC_MAX_SUBSCRIPTIONS);
- return -EINVAL;
+ return NULL;
}
/* Allocate subscription object */
sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
if (!sub) {
pr_warn("Subscription rejected, no memory\n");
- return -ENOMEM;
+ return NULL;
}
/* Initialize subscription object */
@@ -273,22 +273,36 @@ static int tipc_subscrp_create(struct net *net, struct
tipc_subscr *s,
(htohl(s->seq.lower, swap) > htohl(s->seq.upper, swap))) {
pr_warn("Subscription rejected, illegal request\n");
kfree(sub);
- return -EINVAL;
+ return NULL;
}
- spin_lock_bh(&subscriber->lock);
- list_add(&sub->subscrp_list, &subscriber->subscrp_list);
- spin_unlock_bh(&subscriber->lock);
- sub->subscriber = subscriber;
sub->swap = swap;
memcpy(&sub->evt.s, s, sizeof(*s));
atomic_inc(&tn->subscription_count);
setup_timer(&sub->timer, tipc_subscrp_timeout, (unsigned long)sub);
- timeout = htohl(sub->evt.s.timeout, swap);
+ return sub;
+}
+
+static void tipc_subscrp_subscribe(struct net *net, struct tipc_subscr *s,
+ struct tipc_subscriber *subscriber)
+{
+ struct tipc_net *tn = net_generic(net, tipc_net_id);
+ struct tipc_subscription *sub = NULL;
+ u32 timeout;
+
+ sub = tipc_subscrp_create(net, s, subscriber);
+ if (!sub)
+ return tipc_conn_terminate(tn->topsrv, subscriber->conid);
+
+ spin_lock_bh(&subscriber->lock);
+ list_add(&sub->subscrp_list, &subscriber->subscrp_list);
+ spin_unlock_bh(&subscriber->lock);
+
+ sub->subscriber = subscriber;
+ timeout = htohl(sub->evt.s.timeout, sub->swap);
if (!mod_timer(&sub->timer, jiffies + msecs_to_jiffies(timeout)))
tipc_subscrb_get(subscriber);
- *sub_p = sub;
- return 0;
+ tipc_nametbl_subscribe(sub);
}
/* Handle one termination request for the subscriber */
@@ -302,15 +316,8 @@ static void tipc_subscrb_rcv_cb(struct net *net, int conid,
struct sockaddr_tipc *addr, void *usr_data,
void *buf, size_t len)
{
- struct tipc_subscriber *subscriber = usr_data;
- struct tipc_subscription *sub = NULL;
- struct tipc_net *tn = net_generic(net, tipc_net_id);
-
- tipc_subscrp_create(net, (struct tipc_subscr *)buf, subscriber, &sub);
- if (sub)
- tipc_nametbl_subscribe(sub);
- else
- tipc_conn_terminate(tn->topsrv, subscriber->conid);
+ tipc_subscrp_subscribe(net, (struct tipc_subscr *)buf,
+ (struct tipc_subscriber *)usr_data);
}
/* Handle one request to establish a new subscriber */
--
2.1.4
