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function-graph: prevent more than one tracer registering

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Impact: prevent crash due to multiple function graph tracers

The function graph tracer can currently only handle a single tracer
being registered. If another tracer registers with the function
graph tracer it can crash the system.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt 2009-03-24 00:18:31 -04:00
parent 5d1a03dc54
commit 05ce5818ad
1 changed files with 6 additions and 0 deletions
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6
kernel/trace/ftrace.c
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@ -2643,6 +2643,12 @@ int register_ftrace_graph(trace_func_graph_ret_t retfunc,
mutex_lock(&ftrace_lock);
/* we currently allow only one tracer registered at a time */
if (atomic_read(&ftrace_graph_active)) {
ret = -EBUSY;
goto out;
}
ftrace_suspend_notifier.notifier_call = ftrace_suspend_notifier_call;
register_pm_notifier(&ftrace_suspend_notifier);