ipvs: Only call init_service, update_service and done_service for schedulers if defined

There are schedulers that only schedule based on data available in the service
or destination structures and they don't need any persistent storage or
initialization routine. These schedulers currently provide dummy functions for
the init_service, update_service and/or done_service functions. For the
init_service and done_service cases we already have code that only calls these
functions, if the scheduler provides them. Do the same for the update_service
case and remove the dummy functions from all schedulers.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
Signed-off-by: Simon Horman <horms@verge.net.au>

8 files changed, 12 insertions, 123 deletions

diff --git a/net/ipv4/ipvs/ip_vs_ctl.c b/net/ipv4/ipvs/ip_vs_ctl.c
index d1dbd8b311b7..ede101eeec17 100644
--- a/net/ipv4/ipvs/ip_vs_ctl.c
+++ b/net/ipv4/ipvs/ip_vs_ctl.c
@@ -869,7 +869,8 @@ ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user *udest)
                 svc->num_dests++;
 
                 /* call the update_service function of its scheduler */
-                svc->scheduler->update_service(svc);
+                if (svc->scheduler->update_service)
+                        svc->scheduler->update_service(svc);
 
                 write_unlock_bh(&__ip_vs_svc_lock);
                 return 0;
@@ -899,7 +900,8 @@ ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user *udest)
         svc->num_dests++;
 
         /* call the update_service function of its scheduler */
-        svc->scheduler->update_service(svc);
+        if (svc->scheduler->update_service)
+                svc->scheduler->update_service(svc);
 
         write_unlock_bh(&__ip_vs_svc_lock);
 
@@ -949,7 +951,8 @@ ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user *udest)
         IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1);
 
         /* call the update_service, because server weight may be changed */
-        svc->scheduler->update_service(svc);
+        if (svc->scheduler->update_service)
+                svc->scheduler->update_service(svc);
 
         write_unlock_bh(&__ip_vs_svc_lock);
 
@@ -1012,12 +1015,12 @@ static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
          */
         list_del(&dest->n_list);
         svc->num_dests--;
-        if (svcupd) {
-                /*
-                 *  Call the update_service function of its scheduler
-                 */
-                svc->scheduler->update_service(svc);
-        }
+
+        /*
+         *  Call the update_service function of its scheduler
+         */
+        if (svcupd && svc->scheduler->update_service)
+                        svc->scheduler->update_service(svc);
 }
 
 
diff --git a/net/ipv4/ipvs/ip_vs_lblc.c b/net/ipv4/ipvs/ip_vs_lblc.c
index 7a6a319f544a..4a14d069f8ab 100644
--- a/net/ipv4/ipvs/ip_vs_lblc.c
+++ b/net/ipv4/ipvs/ip_vs_lblc.c
@@ -388,12 +388,6 @@ static int ip_vs_lblc_done_svc(struct ip_vs_service *svc)
 }
 
 
-static int ip_vs_lblc_update_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
 static inline struct ip_vs_dest *
 __ip_vs_wlc_schedule(struct ip_vs_service *svc, struct iphdr *iph)
 {
@@ -542,7 +536,6 @@ static struct ip_vs_scheduler ip_vs_lblc_scheduler =
         .n_list =               LIST_HEAD_INIT(ip_vs_lblc_scheduler.n_list),
         .init_service =         ip_vs_lblc_init_svc,
         .done_service =         ip_vs_lblc_done_svc,
-        .update_service =       ip_vs_lblc_update_svc,
         .schedule =             ip_vs_lblc_schedule,
 };
 
diff --git a/net/ipv4/ipvs/ip_vs_lblcr.c b/net/ipv4/ipvs/ip_vs_lblcr.c
index c234e73968a6..46b870385b89 100644
--- a/net/ipv4/ipvs/ip_vs_lblcr.c
+++ b/net/ipv4/ipvs/ip_vs_lblcr.c
@@ -572,12 +572,6 @@ static int ip_vs_lblcr_done_svc(struct ip_vs_service *svc)
 }
 
 
-static int ip_vs_lblcr_update_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
 static inline struct ip_vs_dest *
 __ip_vs_wlc_schedule(struct ip_vs_service *svc, struct iphdr *iph)
 {
@@ -731,7 +725,6 @@ static struct ip_vs_scheduler ip_vs_lblcr_scheduler =
         .n_list =               LIST_HEAD_INIT(ip_vs_lblcr_scheduler.n_list),
         .init_service =         ip_vs_lblcr_init_svc,
         .done_service =         ip_vs_lblcr_done_svc,
-        .update_service =       ip_vs_lblcr_update_svc,
         .schedule =             ip_vs_lblcr_schedule,
 };
 
diff --git a/net/ipv4/ipvs/ip_vs_lc.c b/net/ipv4/ipvs/ip_vs_lc.c
index ebcdbf75ac65..2c3de1b63518 100644
--- a/net/ipv4/ipvs/ip_vs_lc.c
+++ b/net/ipv4/ipvs/ip_vs_lc.c
@@ -20,24 +20,6 @@
 #include <net/ip_vs.h>
 
 
-static int ip_vs_lc_init_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
-static int ip_vs_lc_done_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
-static int ip_vs_lc_update_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
 static inline unsigned int
 ip_vs_lc_dest_overhead(struct ip_vs_dest *dest)
 {
@@ -99,9 +81,6 @@ static struct ip_vs_scheduler ip_vs_lc_scheduler = {
         .refcnt =               ATOMIC_INIT(0),
         .module =               THIS_MODULE,
         .n_list =               LIST_HEAD_INIT(ip_vs_lc_scheduler.n_list),
-        .init_service =         ip_vs_lc_init_svc,
-        .done_service =         ip_vs_lc_done_svc,
-        .update_service =       ip_vs_lc_update_svc,
         .schedule =             ip_vs_lc_schedule,
 };
 
diff --git a/net/ipv4/ipvs/ip_vs_nq.c b/net/ipv4/ipvs/ip_vs_nq.c
index 92f3a6770031..5330d5a2de14 100644
--- a/net/ipv4/ipvs/ip_vs_nq.c
+++ b/net/ipv4/ipvs/ip_vs_nq.c
@@ -37,27 +37,6 @@
 #include <net/ip_vs.h>
 
 
-static int
-ip_vs_nq_init_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
-static int
-ip_vs_nq_done_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
-static int
-ip_vs_nq_update_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
 static inline unsigned int
 ip_vs_nq_dest_overhead(struct ip_vs_dest *dest)
 {
@@ -137,9 +116,6 @@ static struct ip_vs_scheduler ip_vs_nq_scheduler =
         .refcnt =               ATOMIC_INIT(0),
         .module =               THIS_MODULE,
         .n_list =               LIST_HEAD_INIT(ip_vs_nq_scheduler.n_list),
-        .init_service =         ip_vs_nq_init_svc,
-        .done_service =         ip_vs_nq_done_svc,
-        .update_service =       ip_vs_nq_update_svc,
         .schedule =             ip_vs_nq_schedule,
 };
 
diff --git a/net/ipv4/ipvs/ip_vs_rr.c b/net/ipv4/ipvs/ip_vs_rr.c
index 358110d17e59..f74929117534 100644
--- a/net/ipv4/ipvs/ip_vs_rr.c
+++ b/net/ipv4/ipvs/ip_vs_rr.c
@@ -32,12 +32,6 @@ static int ip_vs_rr_init_svc(struct ip_vs_service *svc)
 }
 
 
-static int ip_vs_rr_done_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
 static int ip_vs_rr_update_svc(struct ip_vs_service *svc)
 {
         svc->sched_data = &svc->destinations;
@@ -96,7 +90,6 @@ static struct ip_vs_scheduler ip_vs_rr_scheduler = {
         .module =               THIS_MODULE,
         .n_list =               LIST_HEAD_INIT(ip_vs_rr_scheduler.n_list),
         .init_service =         ip_vs_rr_init_svc,
-        .done_service =         ip_vs_rr_done_svc,
         .update_service =       ip_vs_rr_update_svc,
         .schedule =             ip_vs_rr_schedule,
 };
diff --git a/net/ipv4/ipvs/ip_vs_sed.c b/net/ipv4/ipvs/ip_vs_sed.c
index 77663d84cbd1..53f73bea66ce 100644
--- a/net/ipv4/ipvs/ip_vs_sed.c
+++ b/net/ipv4/ipvs/ip_vs_sed.c
@@ -41,27 +41,6 @@
 #include <net/ip_vs.h>
 
 
-static int
-ip_vs_sed_init_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
-static int
-ip_vs_sed_done_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
-static int
-ip_vs_sed_update_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
 static inline unsigned int
 ip_vs_sed_dest_overhead(struct ip_vs_dest *dest)
 {
@@ -139,9 +118,6 @@ static struct ip_vs_scheduler ip_vs_sed_scheduler =
         .refcnt =               ATOMIC_INIT(0),
         .module =               THIS_MODULE,
         .n_list =               LIST_HEAD_INIT(ip_vs_sed_scheduler.n_list),
-        .init_service =         ip_vs_sed_init_svc,
-        .done_service =         ip_vs_sed_done_svc,
-        .update_service =       ip_vs_sed_update_svc,
         .schedule =             ip_vs_sed_schedule,
 };
 
diff --git a/net/ipv4/ipvs/ip_vs_wlc.c b/net/ipv4/ipvs/ip_vs_wlc.c
index 9b0ef86bb1f7..df7ad8d74766 100644
--- a/net/ipv4/ipvs/ip_vs_wlc.c
+++ b/net/ipv4/ipvs/ip_vs_wlc.c
@@ -25,27 +25,6 @@
 #include <net/ip_vs.h>
 
 
-static int
-ip_vs_wlc_init_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
-static int
-ip_vs_wlc_done_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
-static int
-ip_vs_wlc_update_svc(struct ip_vs_service *svc)
-{
-        return 0;
-}
-
-
 static inline unsigned int
 ip_vs_wlc_dest_overhead(struct ip_vs_dest *dest)
 {
@@ -127,9 +106,6 @@ static struct ip_vs_scheduler ip_vs_wlc_scheduler =
         .refcnt =               ATOMIC_INIT(0),
         .module =               THIS_MODULE,
         .n_list =               LIST_HEAD_INIT(ip_vs_wlc_scheduler.n_list),
-        .init_service =         ip_vs_wlc_init_svc,
-        .done_service =         ip_vs_wlc_done_svc,
-        .update_service =       ip_vs_wlc_update_svc,
         .schedule =             ip_vs_wlc_schedule,
 };