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Commit f2798eb4 authored by Xiao Guangrong's avatar Xiao Guangrong Committed by David S. Miller
Browse files

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: default avatarNeil Horman <nhorman@tuxdriver.com>
Signed-off-by: default avatarXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: default avatarDavid 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();