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tipc: donot create timers if subscription timeout = TIPC_WAIT_FOREVER

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Until now, we create timers even for the subscription requests
with timeout = TIPC_WAIT_FOREVER.
This can be improved by avoiding timer creation when the timeout
is set to TIPC_WAIT_FOREVER.

In this commit, we introduce a check to creates timers only
when timeout != TIPC_WAIT_FOREVER.

Acked-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Parthasarathy Bhuvaragan 2016-02-02 10:52:16 +01:00 committed by David S. Miller
parent f3ad288c56
commit ae245557f8
1 changed files with 11 additions and 3 deletions
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14
net/tipc/subscr.c
View file

@ -188,12 +188,14 @@ static struct tipc_subscriber *tipc_subscrb_create(int conid)
static void tipc_subscrb_delete(struct tipc_subscriber *subscriber)
{
struct tipc_subscription *sub, *temp;
u32 timeout;
spin_lock_bh(&subscriber->lock);
/* Destroy any existing subscriptions for subscriber */
list_for_each_entry_safe(sub, temp, &subscriber->subscrp_list,
subscrp_list) {
if (del_timer(&sub->timer)) {
timeout = htohl(sub->evt.s.timeout, sub->swap);
if ((timeout == TIPC_WAIT_FOREVER) || del_timer(&sub->timer)) {
tipc_subscrp_delete(sub);
tipc_subscrb_put(subscriber);
}
@ -217,13 +219,16 @@ static void tipc_subscrp_cancel(struct tipc_subscr *s,
struct tipc_subscriber *subscriber)
{
struct tipc_subscription *sub, *temp;
u32 timeout;
spin_lock_bh(&subscriber->lock);
/* Find first matching subscription, exit if not found */
list_for_each_entry_safe(sub, temp, &subscriber->subscrp_list,
subscrp_list) {
if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) {
if (del_timer(&sub->timer)) {
timeout = htohl(sub->evt.s.timeout, sub->swap);
if ((timeout == TIPC_WAIT_FOREVER) ||
del_timer(&sub->timer)) {
tipc_subscrp_delete(sub);
tipc_subscrb_put(subscriber);
}
@ -267,7 +272,6 @@ static struct tipc_subscription *tipc_subscrp_create(struct net *net,
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);
return sub;
}
@ -290,6 +294,10 @@ static void tipc_subscrp_subscribe(struct net *net, struct tipc_subscr *s,
spin_unlock_bh(&subscriber->lock);
timeout = htohl(sub->evt.s.timeout, swap);
if (timeout == TIPC_WAIT_FOREVER)
return;
setup_timer(&sub->timer, tipc_subscrp_timeout, (unsigned long)sub);
mod_timer(&sub->timer, jiffies + msecs_to_jiffies(timeout));
}