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
parallel.
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
required.
[0] Make netif_rx_ni preempt-safe
http://oss.sgi.com/projects/netdev/archive/2004-10/msg02211.html
Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
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)
trace_netif_rx_ni_entry(skb);
- preempt_disable();
+ local_bh_disable();
err = netif_rx_internal(skb);
- if (local_softirq_pending())
- do_softirq();
- preempt_enable();
+ local_bh_enable();
return err;
}
--
2.11.0
