When coresight_build_path() fails on all the cpus, etm_setup_aux
calls etm_free_aux() to free allocated event_data.
WARN_ON(cpumask_empty(mask) will be triggered since cpu mask is empty.
Check event_data->snk_config is not NULL first to avoid this
warning.

Signed-off-by: Tingwei Zhang <redacted>
---
 drivers/hwtracing/coresight/coresight-etm-perf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c
index dcb0592418ae..3728c44e5763 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.c
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.c

@@ -126,10 +126,10 @@ static void free_sink_buffer(struct etm_event_data *event_data)
        cpumask_t *mask = &event_data->mask;
        struct coresight_device *sink;

-       if (WARN_ON(cpumask_empty(mask)))
+       if (!event_data->snk_config)
                return;

-       if (!event_data->snk_config)
+       if (WARN_ON(cpumask_empty(mask)))
                return;

        cpu = cpumask_first(mask);
--

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