linux-kernel - [PATCH net-next] xdp: move the if dev statements to the first

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Message-Id: <20211217092545.30204-1-yajun.deng@linux.dev>
Date:   Fri, 17 Dec 2021 17:25:45 +0800
From:   Yajun Deng <yajun.deng@...ux.dev>
To:     ast@...nel.org, daniel@...earbox.net, davem@...emloft.net,
        kuba@...nel.org, hawk@...nel.org, john.fastabend@...il.com
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yajun Deng <yajun.deng@...ux.dev>
Subject: [PATCH net-next] xdp: move the if dev statements to the first

The xdp_rxq_info_unreg() called by xdp_rxq_info_reg() is meaningless when
dev is NULL, so move the if dev statements to the first.

Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
---
 net/core/xdp.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/core/xdp.c b/net/core/xdp.c
index 5ddc29f29bad..7fe1df85f505 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -159,6 +159,11 @@ static void xdp_rxq_info_init(struct xdp_rxq_info *xdp_rxq)
 int xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
 		     struct net_device *dev, u32 queue_index, unsigned int napi_id)
 {
+	if (!dev) {
+		WARN(1, "Missing net_device from driver");
+		return -ENODEV;
+	}
+
 	if (xdp_rxq->reg_state == REG_STATE_UNUSED) {
 		WARN(1, "Driver promised not to register this");
 		return -EINVAL;
@@ -169,11 +174,6 @@ int xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
 		xdp_rxq_info_unreg(xdp_rxq);
 	}
 
-	if (!dev) {
-		WARN(1, "Missing net_device from driver");
-		return -ENODEV;
-	}
-
 	/* State either UNREGISTERED or NEW */
 	xdp_rxq_info_init(xdp_rxq);
 	xdp_rxq->dev = dev;
-- 
2.32.0