linux-kernel - [PATCH net-next] net: stmmac: Remove unused variable 'ret' at stmmac_rx_buf1

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Date:   Thu, 10 Sep 2020 10:42:45 +0800
From:   Luo Jiaxing <luojiaxing@...wei.com>
To:     <peppe.cavallaro@...com>, <alexandre.torgue@...com>,
        <joabreu@...opsys.com>, <davem@...emloft.net>, <kuba@...nel.org>,
        <mcoquelin.stm32@...il.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>
Subject: [PATCH net-next] net: stmmac: Remove unused variable 'ret' at stmmac_rx_buf1_len()

Fixes the following warning when using W=1 to build kernel:

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:3634:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
int ret, coe = priv->hw->rx_csum;

When digging stmmac_get_rx_header_len(), dwmac4_get_rx_header_len() and
dwxgmac2_get_rx_header_len() return 0 by default. Therefore, ret do not
need to check the error value and can be directly deleted.

Signed-off-by: Luo Jiaxing <luojiaxing@...wei.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 89b2b34..7e95412 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3631,15 +3631,15 @@ static unsigned int stmmac_rx_buf1_len(struct stmmac_priv *priv,
 				       struct dma_desc *p,
 				       int status, unsigned int len)
 {
-	int ret, coe = priv->hw->rx_csum;
 	unsigned int plen = 0, hlen = 0;
+	int coe = priv->hw->rx_csum;
 
 	/* Not first descriptor, buffer is always zero */
 	if (priv->sph && len)
 		return 0;
 
 	/* First descriptor, get split header length */
-	ret = stmmac_get_rx_header_len(priv, p, &hlen);
+	stmmac_get_rx_header_len(priv, p, &hlen);
 	if (priv->sph && hlen) {
 		priv->xstats.rx_split_hdr_pkt_n++;
 		return hlen;
-- 
2.7.4