1 files changed, 5 insertions, 2 deletions

diff --git a/net/ipv4/ipvs/ip_vs_sync.c b/net/ipv4/ipvs/ip_vs_sync.c
index 550563a56607..cf5ed758ea1f 100644
--- a/net/ipv4/ipvs/ip_vs_sync.c
+++ b/net/ipv4/ipvs/ip_vs_sync.c
@@ -29,6 +29,7 @@
 #include <linux/udp.h>
 #include <linux/err.h>
 #include <linux/kthread.h>
+#include <linux/wait.h>
 
 #include <net/ip.h>
 #include <net/sock.h>
@@ -772,6 +773,10 @@ static int sync_thread_backup(void *data)
                    ip_vs_backup_mcast_ifn, ip_vs_backup_syncid);
 
         while (!kthread_should_stop()) {
+                wait_event_interruptible(*tinfo->sock->sk->sk_sleep,
+                         !skb_queue_empty(&tinfo->sock->sk->sk_receive_queue)
+                         || kthread_should_stop());
+
                 /* do we have data now? */
                 while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) {
                         len = ip_vs_receive(tinfo->sock, tinfo->buf,
@@ -787,8 +792,6 @@ static int sync_thread_backup(void *data)
                         ip_vs_process_message(tinfo->buf, len);
                         local_bh_enable();
                 }
-
-                msleep_interruptible(1000);
         }
 
         /* release the sending multicast socket */