Commit f2798eb4 authored Aug 30, 2009 by Xiao Guangrong Committed by David S. Miller Sep 01, 2009

drop_monitor: fix trace_napi_poll_hit()



The net_dev of backlog napi is NULL, like below:

__get_cpu_var(softnet_data).backlog.dev == NULL

So, we should check it in napi tracepoint's probe function

Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 3732e9bd

net/core/drop_monitor.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -182,7 +182,8 @@ static void trace_napi_poll_hit(struct napi_struct *napi)
		/*
		* Ratelimit our check time to dm_hw_check_delta jiffies
		*/
		if (!time_after(jiffies, napi->dev->last_rx + dm_hw_check_delta))
		if (!napi->dev \|\|
		!time_after(jiffies, napi->dev->last_rx + dm_hw_check_delta))
		return;

		rcu_read_lock();

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