linux-kernel - [tip:perf/urgent] perf probe: Propagate error code when write(2) failed

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Date:	Sat, 17 Jan 2015 02:10:27 -0800
From:	tip-bot for Namhyung Kim <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	jolsa@...hat.com, masami.hiramatsu.pt@...achi.com, acme@...hat.com,
	namhyung@...nel.org, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, dsahern@...il.com, mingo@...nel.org,
	a.p.zijlstra@...llo.nl, hpa@...or.com
Subject: [tip:perf/urgent] perf probe: Propagate error code when write(2)
  failed

Commit-ID:  7949ba1fa249caa7e611abb8d92f40b0a46c8617
Gitweb:     http://git.kernel.org/tip/7949ba1fa249caa7e611abb8d92f40b0a46c8617
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Sat, 10 Jan 2015 19:33:48 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 16 Jan 2015 17:49:28 -0300

perf probe: Propagate error code when write(2) failed

When it failed to write probe commands to the probe_event file in
debugfs, it needs to propagate the error code properly.  Current code
blindly uses the return value of the write(2) so it always uses
-1 (-EPERM) and it might confuse users.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1420886028-15135-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/probe-event.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 7f9b863..94a717b 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2052,9 +2052,11 @@ static int write_probe_trace_event(int fd, struct probe_trace_event *tev)
 	pr_debug("Writing event: %s\n", buf);
 	if (!probe_event_dry_run) {
 		ret = write(fd, buf, strlen(buf));
-		if (ret <= 0)
+		if (ret <= 0) {
+			ret = -errno;
 			pr_warning("Failed to write event: %s\n",
 				   strerror_r(errno, sbuf, sizeof(sbuf)));
+		}
 	}
 	free(buf);
 	return ret;
--
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