eth/downloader: fix a potential issue against future refactors

96c2ab22 · Péter Szilágyi · 5884606e · 96c2ab22
Unverified Commit 96c2ab22 authored May 02, 2017 by Péter Szilágyi
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downloader.go eth/downloader/downloader.go +4 -0

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--- a/eth/downloader/downloader.go
+++ b/eth/downloader/downloader.go
@@ -1491,6 +1491,10 @@ func (d *Downloader) qosTuner() {
 func (d *Downloader) qosReduceConfidence() {
 	// If we have a single peer, confidence is always 1
 	peers := uint64(d.peers.Len())
+	if peers == 0 {
+		// Ensure peer connectivity races don't catch us off guard
+		return
+	}
 	if peers == 1 {
 		atomic.StoreUint64(&d.rttConfidence, 1000000)
 		return