perf trace: Fix an exit code of trace__symbols_init

Currently if trace_event__register_resolver() fails, we return -errno,
but we can't be sure that errno isn't zero in this case.

Signed-off-by: Andrei Vagin <avagin@openvz.org>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Vasily Averin <vvs@virtuozzo.com>
Link: http://lkml.kernel.org/r/20171108002246.8924-2-avagin@openvz.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index f2757d3..84debdb 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1152,12 +1152,14 @@ static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
        if (trace->host == NULL)
                return -ENOMEM;
 
-       if (trace_event__register_resolver(trace->host, trace__machine__resolve_kernel_addr) < 0)
-               return -errno;
+       err = trace_event__register_resolver(trace->host, trace__machine__resolve_kernel_addr);
+       if (err < 0)
+               goto out;
 
        err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
                                            evlist->threads, trace__tool_process, false,
                                            trace->opts.proc_map_timeout, 1);
+out:
        if (err)
                symbol__exit();