openwrt/target/linux/generic/pending-5.4/770-11-net-ethernet-mtk_eth_soc-avoid-rearming-interrupt-if.patch

From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 4 Sep 2020 18:14:05 +0200
Subject: [PATCH] net: ethernet: mtk_eth_soc: avoid rearming interrupt if
 napi_complete returns false

Reduces unnecessary interrupts

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1536,8 +1536,8 @@ static int mtk_napi_tx(struct napi_struc
 	if (status & MTK_TX_DONE_INT)
 		return budget;
 
-	napi_complete(napi);
-	mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
+	if (napi_complete(napi))
+		mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
 
 	return tx_done;
 }
@@ -1570,8 +1570,9 @@ poll_again:
 		remain_budget -= rx_done;
 		goto poll_again;
 	}
-	napi_complete(napi);
-	mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
+
+	if (napi_complete(napi))
+		mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
 
 	return rx_done + budget - remain_budget;
 }