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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>
This commit is contained in:
Steven Rostedt 2008-05-12 21:20:58 +02:00 committed by Thomas Gleixner
parent b5685aede3
commit 845279972f
1 changed files with 3 additions and 0 deletions
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3
kernel/trace/trace.c
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@ -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