Commit 11a241a3 authored by Steven Rostedt's avatar Steven Rostedt

tracing: add protection around modify trace event fields

The trace event objects are currently not proctected against
reentrancy. This patch adds a mutex around the modifications of
the trace event fields.
Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
parent d20e3b03
......@@ -14,6 +14,8 @@
#define TRACE_SYSTEM "TRACE_SYSTEM"
static DEFINE_MUTEX(event_mutex);
#define events_for_each(event) \
for (event = __start_ftrace_events; \
(unsigned long)event < (unsigned long)__stop_ftrace_events; \
......@@ -104,6 +106,7 @@ static int ftrace_set_clr_event(char *buf, int set)
event = NULL;
}
mutex_lock(&event_mutex);
events_for_each(call) {
if (!call->name)
......@@ -124,6 +127,8 @@ static int ftrace_set_clr_event(char *buf, int set)
ret = 0;
}
mutex_unlock(&event_mutex);
return ret;
}
......@@ -324,7 +329,9 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
switch (val) {
case 0:
case 1:
mutex_lock(&event_mutex);
ftrace_event_enable_disable(call, val);
mutex_unlock(&event_mutex);
break;
default:
......
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