[PATCH] perf evlist: Restore original errno after open failed

[Namhyung Kim]

If perf_evsel__open() failed, the errno was set and returned properly.
However since the perf_evlist__open() called close() on fd's for all of
evsel x cpu x thread after the failure, the errno was overridden by
other code (EBADF). So the caller of the function ended up seeing
different error message and getting confused.

Fit it by restoring original return value. Because one of caller of the
function is in the python extension, and it uses system errno internally,
it'd be better restoring the original value rather than using the return
value of the function directly, IMHO (i.e. I'm not a python expert :)

Signed-off-by: Namhyung Kim <namhyung.kim@xxxxxxx>
---
 tools/perf/util/evlist.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index ec4e338ee291..1986d8051bd1 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -767,6 +767,7 @@ out_err:
 	list_for_each_entry_reverse(evsel, &evlist->entries, node)
 		perf_evsel__close(evsel, ncpus, nthreads);
 
+	errno = -err;
 	return err;
 }
 
-- 
1.7.9

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/