netdev - [PATCH 1/2] Revert "bpf: veth driver panics when xdp prog attached before veth

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Message-Id: <20221122035015.19296-2-hengqi@linux.alibaba.com>
Date:   Tue, 22 Nov 2022 11:50:14 +0800
From:   Heng Qi <hengqi@...ux.alibaba.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     Paolo Abeni <pabeni@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        John Fastabend <john.fastabend@...il.com>, toke@...nel.org
Subject: [PATCH 1/2] Revert "bpf: veth driver panics when xdp prog attached before veth_open"

This reverts commit 5e5dc33d5dacb34b0165061bc5a10efd2fd3b66f.

This patch fixes the panic maked by 2e0de6366ac16. Now Paolo
and Toke suggest reverting the patch 2e0de6366ac16 and making
it stronger, so do this first.

Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/veth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 2a4592780141..b1ed5a93b6c5 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1125,7 +1125,7 @@ static int veth_enable_xdp(struct net_device *dev)
 	int err, i;
 
 	rq = &priv->rq[0];
-	napi_already_on = rcu_access_pointer(rq->napi);
+	napi_already_on = (dev->flags & IFF_UP) && rcu_access_pointer(rq->napi);
 
 	if (!xdp_rxq_info_is_reg(&priv->rq[0].xdp_rxq)) {
 		err = veth_enable_xdp_range(dev, 0, dev->real_num_rx_queues, napi_already_on);
-- 
2.19.1.6.gb485710b