perf evsel: Always preserve errno while cleaning up perf_event_open failures

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In some cases when perf_event_open fails, it may do some closes to clean
up. In special cases these closes can fail too, which overwrites the
errno of the perf_event_open, which is then incorrectly reported.

Save/restore errno around closes.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20191020175202.32456-2-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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Andi Kleen 2019-10-20 10:51:54 -07:00 • committed by Arnaldo Carvalho de Melo

parent 9d604aad4b

commit 796c01a4bf

1 changed files with 4 additions and 2 deletions

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tools/perf/util/evsel.c

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