X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=blobdiff_plain;f=kernel%2Ftrace%2Fftrace.c;h=678e3d6caf85ad4dc32879fffbc066cb45fb4181;hp=c7f4a4be05dc0f96c35fec5163c23f7761d081fd;hb=93776a8ec746cf9d32c36e5a5b23d28d8be28826;hpb=34886c8bc590f078d4c0b88f50d061326639198d

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index c7f4a4be05dc..678e3d6caf85 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -928,9 +928,14 @@ void ftrace_release(void *start, unsigned long size)
 
 	mutex_lock(&ftrace_lock);
 	do_for_each_ftrace_rec(pg, rec) {
-		if ((rec->ip >= s) && (rec->ip < e) &&
-		    !(rec->flags & FTRACE_FL_FREE))
+		if ((rec->ip >= s) && (rec->ip < e)) {
+			/*
+			 * rec->ip is changed in ftrace_free_rec()
+			 * It should not between s and e if record was freed.
+			 */
+			FTRACE_WARN_ON(rec->flags & FTRACE_FL_FREE);
 			ftrace_free_rec(rec);
+		}
 	} while_for_each_ftrace_rec();
 	mutex_unlock(&ftrace_lock);
 }
@@ -3287,6 +3292,9 @@ void unregister_ftrace_graph(void)
 {
 	mutex_lock(&ftrace_lock);
 
+	if (!unlikely(atomic_read(&ftrace_graph_active)))
+		goto out;
+
 	atomic_dec(&ftrace_graph_active);
 	unregister_trace_sched_switch(ftrace_graph_probe_sched_switch);
 	ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub;
@@ -3294,6 +3302,7 @@ void unregister_ftrace_graph(void)
 	ftrace_shutdown(FTRACE_STOP_FUNC_RET);
 	unregister_pm_notifier(&ftrace_suspend_notifier);
 
+ out:
 	mutex_unlock(&ftrace_lock);
 }