ftrace: return EOF in trace_pipe on change of tracer

Break out of while loop with EOF when the current_trace changes. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
git-mirror · May 23, 2008 · 8452799 · 8452799
1 parent b5685ae
commit 8452799
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
@@ -2253,6 +2253,9 @@ tracing_read_pipe(struct file *filp, char __user *ubuf,
 		if (signal_pending(current))
 			return -EINTR;
 
+		if (iter->trace != current_trace)
+			return 0;
+
 		/*
 		 * We block until we read something and tracing is disabled.
 		 * We still block if tracing is disabled, but we have never