linux-kernel - [tip:perf/urgent] perf record: Fix s390 undefined record__auxtrace

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Date:   Wed, 25 Apr 2018 22:55:43 -0700
From:   tip-bot for Thomas Richter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     brueckner@...ux.vnet.ibm.com, tmricht@...ux.ibm.com,
        linux-kernel@...r.kernel.org, schwidefsky@...ibm.com,
        tglx@...utronix.de, heiko.carstens@...ibm.com, mingo@...nel.org,
        hpa@...or.com, acme@...hat.com
Subject: [tip:perf/urgent] perf record: Fix s390 undefined
 record__auxtrace_init() return value

Commit-ID:  5d9946c3e5e38e07ab7019db9413a96807a325f2
Gitweb:     https://git.kernel.org/tip/5d9946c3e5e38e07ab7019db9413a96807a325f2
Author:     Thomas Richter <tmricht@...ux.ibm.com>
AuthorDate: Mon, 23 Apr 2018 16:29:40 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 23 Apr 2018 12:05:02 -0300

perf record: Fix s390 undefined record__auxtrace_init() return value

Command 'perf record' calls:

  cmd_report()
    record__auxtrace_init()
       auxtrace_record__init()

On s390 function auxtrace_record__init() returns random return value due
to missing initialization.

This sometime causes 'perf record' to exit immediately without error
message and creating a perf.data file.

Fix this by setting error the return code to zero before returning from
platform specific functions which may not set the error code in call
cases.

Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Link: http://lkml.kernel.org/r/20180423142940.21143-1-tmricht@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/arch/s390/util/auxtrace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/arch/s390/util/auxtrace.c b/tools/perf/arch/s390/util/auxtrace.c
index 6cb48e4cffd9..3afe8256eff2 100644
--- a/tools/perf/arch/s390/util/auxtrace.c
+++ b/tools/perf/arch/s390/util/auxtrace.c
@@ -87,6 +87,7 @@ struct auxtrace_record *auxtrace_record__init(struct perf_evlist *evlist,
 	struct perf_evsel *pos;
 	int diagnose = 0;
 
+	*err = 0;
 	if (evlist->nr_entries == 0)
 		return NULL;