tree 480235ce9efabae5c0142617affa7a4b510ccf3a
parent 3732e9bd2d841db588624b1bf560bfc9d0dcb1fd
author Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> 1251663043 +0000
committer David S. Miller <davem@davemloft.net> 1251854292 -0700

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>