les: fix misuse of WaitGroup (ethereum#15365)

gkapkowski · Nov 9, 2017 · 0914d4e · 0914d4e
1 parent 9619a61
commit 0914d4e
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/les/fetcher.go b/les/fetcher.go
@@ -117,16 +117,16 @@ func newLightFetcher(pm *ProtocolManager) *lightFetcher {
 		maxConfirmedTd: big.NewInt(0),
 	}
 	pm.peers.notify(f)
+
+	f.pm.wg.Add(1)
 	go f.syncLoop()
 	return f
 }
 
 // syncLoop is the main event loop of the light fetcher
 func (f *lightFetcher) syncLoop() {
-	f.pm.wg.Add(1)
-	defer f.pm.wg.Done()
-
 	requesting := false
+	defer f.pm.wg.Done()
 	for {
 		select {
 		case <-f.pm.quitSync: