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From: Sebastian Andrzej Siewior <>
To: Eric Dumazet <>
Cc:, "David S. Miller" <>,
	Thomas Gleixner <>,
	Sebastian Andrzej Siewior <>
Subject: [PATCH 1/2] net/core: use local_bh_disable() in netif_rx_ni()
Date: Fri, 16 Jun 2017 19:23:59 +0200	[thread overview]
Message-ID: <> (raw)

In 2004 [0] netif_rx_ni() gained a preempt_disable() section around
netif_rx() and its do_softirq() + testing for it. The do_softirq() part
is required because netif_rx() raises the softirq but does not invoke
it. The preempt_disable() is required to avoid running the BH in
All this can be avoided be putting this into a local_bh_disable()ed
section. The local_bh_enable() part will invoke do_softirq() if

[0] Make netif_rx_ni preempt-safe

Signed-off-by: Sebastian Andrzej Siewior <>
 net/core/dev.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index b8d6dd9e8b5c..b1f8a89322bd 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3928,11 +3928,9 @@ int netif_rx_ni(struct sk_buff *skb)
-	preempt_disable();
+	local_bh_disable();
 	err = netif_rx_internal(skb);
-	if (local_softirq_pending())
-		do_softirq();
-	preempt_enable();
+	local_bh_enable();
 	return err;

             reply	other threads:[~2017-06-16 17:24 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-16 17:23 Sebastian Andrzej Siewior [this message]
2017-06-16 17:24 ` [PATCH 2/2] net/core: remove explicit do_softirq() from busy_poll_stop() Sebastian Andrzej Siewior
2017-06-20 17:09   ` David Miller
2017-06-20 17:08 ` [PATCH 1/2] net/core: use local_bh_disable() in netif_rx_ni() David Miller

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