From: compudj@krystal.dyndns.org (Mathieu Desnoyers)
Subject: [ltt-dev] [PATCH] lttng: Fix list-break bug
Date: Fri, 9 Jan 2009 09:51:52 -0500 [thread overview]
Message-ID: <20090109145152.GC7262@Krystal> (raw)
In-Reply-To: <49671D62.6080903@cn.fujitsu.com>
* 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, <t_traces.head, list)
> _ltt_trace_stop(trace);
> - tmp = ltt_traces.head;
> - /* empty the original list head */
> - INIT_LIST_HEAD(<t_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, <t_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
>
>
> _______________________________________________
> ltt-dev mailing list
> ltt-dev at lists.casi.polymtl.ca
> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
>
--
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
next prev parent reply other threads:[~2009-01-09 14:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-09 9:48 Gui Jianfeng
2009-01-09 14:51 ` Mathieu Desnoyers [this message]
2009-01-09 15:17 ` Mathieu Desnoyers
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