From c57fdd7cefc4e7a9652b26ef89679fa8743e5b6b Mon Sep 17 00:00:00 2001
From: j75689 <j75689@gmail.com>
Date: Wed, 20 Apr 2022 15:27:30 +0800
Subject: [PATCH] fix comments

---
 core/blockchain.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/core/blockchain.go b/core/blockchain.go
index 3b1c3c96b4..1ca43ec7c8 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -227,7 +227,7 @@ type BlockChain struct {
 	// trusted diff layers
 	diffLayerCache             *lru.Cache   // Cache for the diffLayers
 	diffLayerRLPCache          *lru.Cache   // Cache for the rlp encoded diffLayers
-	diffLayerChanCache         *lru.Cache   // Cache for
+	diffLayerChanCache         *lru.Cache   // Cache for the difflayer channel
 	diffQueue                  *prque.Prque // A Priority queue to store recent diff layer
 	diffQueueBuffer            chan *types.DiffLayer
 	diffLayerFreezerBlockLimit uint64
@@ -1834,6 +1834,9 @@ func (bc *BlockChain) writeBlockWithState(block *types.Block, receipts []*types.
 		diffLayer.Number = block.NumberU64()
 
 		diffLayerCh := make(chan struct{})
+		if bc.diffLayerChanCache.Len() >= diffLayerCacheLimit {
+			bc.diffLayerChanCache.RemoveOldest()
+		}
 		bc.diffLayerChanCache.Add(diffLayer.BlockHash, diffLayerCh)
 
 		go bc.cacheDiffLayer(diffLayer, false)