diff options
| author | Masami Hiramatsu <mhiramat@redhat.com> | 2009-09-14 16:49:12 -0400 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2009-09-17 04:03:50 +0200 |
| commit | 4fead8e46fded93cc0d432ced774d9a3a8d21bad (patch) | |
| tree | 10e62eec4074bb2b97d8a37ce29f58a0149d25f9 | |
| parent | 588bebb74fe87270f94c2810652bd683d63c4b54 (diff) | |
ftrace: Fix trace_remove_event_call() to lock trace_event_mutex
Lock not only event_mutex but also trace_event_mutex in
trace_remove_event_call() to protect __unregister_ftrace_event().
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jason Baron <jbaron@redhat.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <20090914204912.18779.68734.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| -rw-r--r-- | kernel/trace/trace_events.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 83cc2c01195..f85b0f1cb94 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -1054,6 +1054,9 @@ static void remove_subsystem_dir(const char *name) } } +/* + * Must be called under locking both of event_mutex and trace_event_mutex. + */ static void __trace_remove_event_call(struct ftrace_event_call *call) { ftrace_event_enable_disable(call, 0); @@ -1070,7 +1073,9 @@ static void __trace_remove_event_call(struct ftrace_event_call *call) void trace_remove_event_call(struct ftrace_event_call *call) { mutex_lock(&event_mutex); + down_write(&trace_event_mutex); __trace_remove_event_call(call); + up_write(&trace_event_mutex); mutex_unlock(&event_mutex); } |