linux-kernel - [PATCH perf/core 2/2] [BUGFIX] perf probe: Fix an error when deleting probes successfully

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Date:	Wed, 27 May 2015 17:37:25 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Richard Weinberger <richard@....at>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>, namhyung@...nel.org,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>
Subject: [PATCH perf/core 2/2] [BUGFIX] perf probe: Fix an error when
 deleting probes successfully

Fix a bug in del_perf_probe_events() which returns an error
(-ENOENT) even if the probes are successfully deleted.
This happens only if the probes are on user-apps and not on
kernel, simply because it doesn't clear the previous error.

So, without this fix, we get an error even though events
are successfully removed.
  ------
  # ./perf probe -x ./perf del_perf_probe_events
  Added new event:
    probe_perf:del_perf_probe_events (on del_perf_probe_events in ...

  You can now use it in all perf tools, such as:

          perf record -e probe_perf:del_perf_probe_events -aR sleep 1

  # ./perf probe -d \*:\*
  Removed event: probe_perf:del_perf_probe_events
    Error: Failed to delete events.
  ------

This fixes the above error.
  ------
  # ./perf probe -d \*:\*
  Removed event: probe_perf:del_perf_probe_events
  ------

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Reported-by: Arnaldo Carvalho de Melo <acme@...nel.org>
---
 tools/perf/util/probe-event.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index f5be411..97da984 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2811,13 +2811,14 @@ int del_perf_probe_events(struct strfilter *filter)
 		goto error;
 
 	ret2 = del_trace_probe_events(ufd, filter, unamelist);
-	if (ret2 < 0 && ret2 != -ENOENT)
+	if (ret2 < 0 && ret2 != -ENOENT) {
 		ret = ret2;
-	else if (ret == -ENOENT && ret2 == -ENOENT) {
+		goto error;
+	}
+	if (ret == -ENOENT && ret2 == -ENOENT)
 		pr_debug("\"%s\" does not hit any event.\n", str);
 		/* Note that this is silently ignored */
-		ret = 0;
-	}
+	ret = 0;
 
 error:
 	if (kfd >= 0) {


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