linux-kernel - [PATCH net-next 03/11] tuntap: enable bh early during processing XDP

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Message-Id: <20180906040526.22518-4-jasowang@redhat.com>
Date:   Thu,  6 Sep 2018 12:05:18 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        mst@...hat.com, jasowang@...hat.com
Subject: [PATCH net-next 03/11] tuntap: enable bh early during processing XDP

This patch move the bh enabling a little bit earlier, this will be
used for factoring out the core XDP logic of tuntap.

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/net/tun.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index d3677a544b56..372caf7d67d9 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1726,22 +1726,18 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 			goto err_xdp;
 		}
 	}
+	rcu_read_unlock();
+	local_bh_enable();
 
 	skb = build_skb(buf, buflen);
-	if (!skb) {
-		rcu_read_unlock();
-		local_bh_enable();
+	if (!skb)
 		return ERR_PTR(-ENOMEM);
-	}
 
 	skb_reserve(skb, pad - delta);
 	skb_put(skb, len);
 	get_page(alloc_frag->page);
 	alloc_frag->offset += buflen;
 
-	rcu_read_unlock();
-	local_bh_enable();
-
 	return skb;
 
 err_redirect:
-- 
2.17.1