From 916a3e196ea0013553ac47acc86f5eae95c99737 Mon Sep 17 00:00:00 2001
From: lash <dev@holbrook.no>
Date: Fri, 12 Oct 2018 13:55:47 +0200
Subject: [PATCH] swarm/storage: Eliminate potential duplicate gc under lock

---
 swarm/storage/ldbstore.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/swarm/storage/ldbstore.go b/swarm/storage/ldbstore.go
index e6f277110d..49508911f9 100644
--- a/swarm/storage/ldbstore.go
+++ b/swarm/storage/ldbstore.go
@@ -314,10 +314,12 @@ func decodeData(addr Address, data []byte) (*chunk, error) {
 func (s *LDBStore) collectGarbage() error {
 
 	// prevent duplicate gc from starting when one is already running
-	if len(s.gc.runC) == 0 {
+	select {
+	case <-s.gc.runC:
+	default:
 		return nil
 	}
-	<-s.gc.runC
+
 	s.lock.Lock()
 	entryCnt := s.entryCnt
 	s.lock.Unlock()