[ltt-dev] [PATCH] lttng: Fix list-break bug

[Mathieu Desnoyers]

* Gui Jianfeng (guijianfeng at cn.fujitsu.com) wrote:
> Hi Mathieu
> When removing ltt-tracer module, OOPS happens.
> Because "tmp = ltt_traces.head;" breaks the list.
> This patch fix it.
> 

Will merge, thanks !

Mathieu

> Signed-off-by: Gui Jianfeng <guijianfeng at cn.fujitsu.com>
> ---
>  ltt/ltt-tracer.c |    6 +-----
>  1 files changed, 1 insertions(+), 5 deletions(-)
> 
> diff --git a/ltt/ltt-tracer.c b/ltt/ltt-tracer.c
> index af14135..ceb0c04 100644
> --- a/ltt/ltt-tracer.c
> +++ b/ltt/ltt-tracer.c
> @@ -1159,20 +1159,16 @@ static void __exit ltt_exit(void)
>  {
>  	struct ltt_trace_struct *trace;
>  	struct list_head *pos, *n;
> -	struct list_head tmp;
>  
>  	ltt_lock_traces();
>  	/* Stop each trace, currently being read by RCU read-side */
>  	list_for_each_entry_rcu(trace, &ltt_traces.head, list)
>  		_ltt_trace_stop(trace);
> -	tmp = ltt_traces.head;
> -	/* empty the original list head */
> -	INIT_LIST_HEAD(&ltt_traces.head);
>  	/* Wait for quiescent state. Readers have preemption disabled. */
>  	synchronize_sched();
>  	/* Safe iteration is now permitted. It does not have to be RCU-safe
>  	 * because no readers are left. */
> -	list_for_each_safe(pos, n, &tmp) {
> +	list_for_each_safe(pos, n, &ltt_traces.head) {
>  		trace = container_of(pos, struct ltt_trace_struct, list);
>  		/* _ltt_trace_destroy does a synchronize_sched() */
>  		_ltt_trace_destroy(trace);
> -- 
> 1.5.4.rc3
> 
> -- 
> Regards
> Gui Jianfeng
> 
> 
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-- 
Mathieu Desnoyers
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