[rfc 06/13] [RFC 06/13] IPVS: Allow null argument to ip_vs_scheduler_put()

[Simon Horman <horms@verge.net.au>]

[-- Attachment #1: 0006-IPVS-Allow-null-argument-to-ip_vs_scheduler_put.patch --]
[-- Type: text/plain, Size: 2083 bytes --]

This simplifies caller logic sightly.

Signed-off-by: Simon Horman <horms@verge.net.au>
---
 net/netfilter/ipvs/ip_vs_ctl.c   |   13 ++++---------
 net/netfilter/ipvs/ip_vs_sched.c |    2 +-
 2 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 0f0c079..84dae47 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -1167,7 +1167,7 @@ ip_vs_add_service(struct ip_vs_service_user_kern *u,
 	if (sched == NULL) {
 		pr_info("Scheduler module ip_vs_%s not found\n", u->sched_name);
 		ret = -ENOENT;
-		goto out_mod_dec;
+		goto out_err;
 	}
 
 #ifdef CONFIG_IP_VS_IPV6
@@ -1227,7 +1227,7 @@ ip_vs_add_service(struct ip_vs_service_user_kern *u,
 	*svc_p = svc;
 	return 0;
 
-  out_err:
+ out_err:
 	if (svc != NULL) {
 		if (svc->scheduler)
 			ip_vs_unbind_scheduler(svc);
@@ -1240,7 +1240,6 @@ ip_vs_add_service(struct ip_vs_service_user_kern *u,
 	}
 	ip_vs_scheduler_put(sched);
 
-  out_mod_dec:
 	/* decrease the module use count */
 	ip_vs_use_count_dec();
 
@@ -1323,10 +1322,7 @@ ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
 #ifdef CONFIG_IP_VS_IPV6
   out:
 #endif
-
-	if (old_sched)
-		ip_vs_scheduler_put(old_sched);
-
+	ip_vs_scheduler_put(old_sched);
 	return ret;
 }
 
@@ -1350,8 +1346,7 @@ static void __ip_vs_del_service(struct ip_vs_service *svc)
 	/* Unbind scheduler */
 	old_sched = svc->scheduler;
 	ip_vs_unbind_scheduler(svc);
-	if (old_sched)
-		ip_vs_scheduler_put(old_sched);
+	ip_vs_scheduler_put(old_sched);
 
 	/* Unbind app inc */
 	if (svc->inc) {
diff --git a/net/netfilter/ipvs/ip_vs_sched.c b/net/netfilter/ipvs/ip_vs_sched.c
index bbc1ac7..cd77902 100644
--- a/net/netfilter/ipvs/ip_vs_sched.c
+++ b/net/netfilter/ipvs/ip_vs_sched.c
@@ -159,7 +159,7 @@ struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name)
 
 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler)
 {
-	if (scheduler->module)
+	if (scheduler && scheduler->module)
 		module_put(scheduler->module);
 }
 
-- 
1.7.1