perf cs-etm: Bail out immediately for instruction sample failure

If the instruction sample failure has happened, it isn't necessary to
execute to the end of the function cs_etm__flush().  This commit is to
bail out immediately and return the error code.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kim Phillips <kim.phillips@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Walker <robert.walker@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1529298599-3876-3-git-send-email-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 822ba91..8b2c099 100644 (file)
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -939,6 +939,9 @@ static int cs_etm__flush(struct cs_etm_queue *etmq)
                err = cs_etm__synth_instruction_sample(
                        etmq, addr,
                        etmq->period_instructions);
+               if (err)
+                       return err;
+
                etmq->period_instructions = 0;
 
                /*