linux-kernel - [PATCH] perf record: Fix s390 random record__auxtrace

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Date:   Mon, 23 Apr 2018 16:29:40 +0200
From:   Thomas Richter <tmricht@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org
Cc:     brueckner@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, Thomas Richter <tmricht@...ux.ibm.com>
Subject: [PATCH] perf record: Fix s390 random 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 return code to zero before return
from platform specific function which does not set the
error code in call cases.

Signed-off-by: Thomas Richter <tmricht@...ux.ibm.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;
 
-- 
2.14.3