netdev - [PATCH] net: stmmac: Fix RX Coalesce IOC always true issue

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Date:   Tue, 9 Jun 2020 17:41:33 +0800
From:   Biao Huang <biao.huang@...iatek.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>
CC:     <linux-mediatek@...ts.infradead.org>, <yt.shen@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <biao.huang@...iatek.com>
Subject: [PATCH] net: stmmac: Fix RX Coalesce IOC always true issue

Currently rx_count_frames in stmmac_rx_refill always 0, which leads to
use_rx_wd false, and IOC bit of rx_desc3 true forever. Fix it.

Fixes: 6fa9d691b91ac ("net: stmmac: Prevent divide-by-zero")
Signed-off-by: Biao Huang <biao.huang@...iatek.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index e6898fd5223f..87b529743fd0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3607,8 +3607,7 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv, u32 queue)
 		stmmac_refill_desc3(priv, rx_q, p);
 
 		rx_q->rx_count_frames++;
-		rx_q->rx_count_frames += priv->rx_coal_frames;
-		if (rx_q->rx_count_frames > priv->rx_coal_frames)
+		if (rx_q->rx_count_frames >= priv->rx_coal_frames)
 			rx_q->rx_count_frames = 0;
 
 		use_rx_wd = !priv->rx_coal_frames;
-- 
2.18.0