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drop_monitor: fix trace_napi_poll_hit()
authorXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Sun, 30 Aug 2009 20:10:43 +0000 (20:10 +0000)
committerDavid S. Miller <davem@davemloft.net>
Wed, 2 Sep 2009 01:18:12 +0000 (18:18 -0700)
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>

No differences found
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