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tracing/events: fix concurrent access to ftrace_events list, fix

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In filter_add_subsystem_pred() we should release event_mutex before
calling filter_free_subsystem_preds(), since both functions hold
event_mutex.

[ Impact: fix deadlock when writing invalid pred into subsystem filter ]

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: tzanussi@gmail.com
Cc: a.p.zijlstra@chello.nl
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
LKML-Reference: <4A028993.7020509@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-05-07 15:11:15 +08:00 committed by Ingo Molnar
parent 5928c3cc0f
commit d94fc523f3
1 changed files with 3 additions and 2 deletions
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5
kernel/trace/trace_events_filter.c
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@ -636,14 +636,15 @@ static int filter_add_subsystem_pred(struct filter_parse_state *ps,
err = filter_add_pred(ps, call, pred);
if (err) {
mutex_unlock(&event_mutex);
filter_free_subsystem_preds(system);
parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0);
break;
goto out;
}
replace_filter_string(call->filter, filter_string);
}
mutex_unlock(&event_mutex);
out:
return err;
}