linux-kernel - [PATCH AUTOSEL 4.14 13/23] net: ethernet: ti: davinci_emac: Fix return type of emac_dev

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Message-Id: <20221009222557.1219968-13-sashal@kernel.org>
Date:   Sun,  9 Oct 2022 18:25:43 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nathan Huckleberry <nhuck@...gle.com>,
        Dan Carpenter <error27@...il.com>, llvm@...ts.linux.dev,
        Nathan Chancellor <nathan@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, ndesaulniers@...gle.com,
        prabhakar.mahadev-lad.rj@...renesas.com, paul@....org,
        grygorii.strashko@...com, wsa+renesas@...g-engineering.com,
        chi.minghao@....com.cn, bigunclemax@...il.com,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 13/23] net: ethernet: ti: davinci_emac: Fix return type of emac_dev_xmit

From: Nathan Huckleberry <nhuck@...gle.com>

[ Upstream commit 5972ca946098487c5155fe13654743f9010f5ed5 ]

The ndo_start_xmit field in net_device_ops is expected to be of type
netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, struct net_device *dev).

The mismatched return type breaks forward edge kCFI since the underlying
function definition does not match the function hook definition.

The return type of emac_dev_xmit should be changed from int to
netdev_tx_t.

Reported-by: Dan Carpenter <error27@...il.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1703
Cc: llvm@...ts.linux.dev
Signed-off-by: Nathan Huckleberry <nhuck@...gle.com>
Reviewed-by: Nathan Chancellor <nathan@...nel.org>
Link: https://lore.kernel.org/r/20220912195023.810319-1-nhuck@google.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/ti/davinci_emac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
index da536385075a..f226e8f84835 100644
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -955,7 +955,7 @@ static void emac_tx_handler(void *token, int len, int status)
  *
  * Returns success(NETDEV_TX_OK) or error code (typically out of desc's)
  */
-static int emac_dev_xmit(struct sk_buff *skb, struct net_device *ndev)
+static netdev_tx_t emac_dev_xmit(struct sk_buff *skb, struct net_device *ndev)
 {
 	struct device *emac_dev = &ndev->dev;
 	int ret_code;
-- 
2.35.1