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Commit 84527997 authored by Steven Rostedt's avatar Steven Rostedt Committed by Thomas Gleixner
Browse files

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: default avatarSteven Rostedt <srostedt@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent b5685aed

kernel/trace/trace.c

+3 −0
Original line number Original line Diff line number Diff line
@@ -2253,6 +2253,9 @@ tracing_read_pipe(struct file *filp, char __user *ubuf, 
		if (signal_pending(current))

		if (signal_pending(current))

			return -EINTR;

			return -EINTR;





		if (iter->trace != current_trace)

			return 0;



		/*

		/*

		 * We block until we read something and tracing is disabled.

		 * We block until we read something and tracing is disabled.

		 * We still block if tracing is disabled, but we have never

		 * We still block if tracing is disabled, but we have never