Messages in this thread Patch in this message | | | Date | Thu, 27 Aug 2009 18:40:08 +0800 | From | Xiao Guangrong <> | Subject | [PATCH 1/3] drop_monitor: fix trace_napi_poll_hit() |
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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
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> --- net/core/drop_monitor.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c index 9d66fa9..d311202 100644 --- a/net/core/drop_monitor.c +++ b/net/core/drop_monitor.c @@ -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(); -- 1.6.1.2
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