trace: fix logic to start/stop counting

The logic in the tracing_start/stop code prevents the WARN_ON
from ever detecting if a start/stop pair was mismatched.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 6 insertions, 7 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 757ae6f7e648..2129ab9d2a48 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -610,13 +610,12 @@ void tracing_start(void)
                 return;
 
         spin_lock_irqsave(&tracing_start_lock, flags);
-        if (--trace_stop_count)
-                goto out;
-
-        if (trace_stop_count < 0) {
-                /* Someone screwed up their debugging */
-                WARN_ON_ONCE(1);
-                trace_stop_count = 0;
+        if (--trace_stop_count) {
+                if (trace_stop_count < 0) {
+                        /* Someone screwed up their debugging */
+                        WARN_ON_ONCE(1);
+                        trace_stop_count = 0;
+                }
                 goto out;
         }