linux-kernel - [RFC PATCH net-next 06/12] tuntap: enable premmption early

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Message-Id: <1526893473-20128-7-git-send-email-jasowang@redhat.com>
Date:   Mon, 21 May 2018 17:04:27 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH net-next 06/12] tuntap: enable premmption early

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/net/tun.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 44d4f3d..24ecd82 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1697,6 +1697,8 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 			goto err_xdp;
 		}
 	}
+	rcu_read_unlock();
+	preempt_enable();
 
 	skb = build_skb(buf, buflen);
 	if (!skb) {
@@ -1710,9 +1712,6 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 	get_page(alloc_frag->page);
 	alloc_frag->offset += buflen;
 
-	rcu_read_unlock();
-	preempt_enable();
-
 	return skb;
 
 err_redirect:
-- 
2.7.4