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

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
......@@ -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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