From 2e97942fe57864588774f173cf4cd7bb68968b76 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 21 May 2010 16:22:33 +0200 Subject: [PATCH] perf_events, trace: Fix perf_trace_destroy(), mutex went missing Steve spotted I forgot to do the destroy under event_mutex. Reported-by: Steven Rostedt Signed-off-by: Peter Zijlstra LKML-Reference: <1274451913.1674.1707.camel@laptop> Signed-off-by: Ingo Molnar --- kernel/trace/trace_event_perf.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c index 49c7abf..e6f6588 100644 --- a/kernel/trace/trace_event_perf.c +++ b/kernel/trace/trace_event_perf.c @@ -132,8 +132,9 @@ void perf_trace_destroy(struct perf_event *p_event) struct ftrace_event_call *tp_event = p_event->tp_event; int i; + mutex_lock(&event_mutex); if (--tp_event->perf_refcount > 0) - return; + goto out; if (tp_event->class->reg) tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER); @@ -157,6 +158,8 @@ void perf_trace_destroy(struct perf_event *p_event) perf_trace_buf[i] = NULL; } } +out: + mutex_unlock(&event_mutex); } __kprobes void *perf_trace_buf_prepare(int size, unsigned short type, -- 2.7.4