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coresight: etm: perf: Fix warning caused by etm_setup_aux failure

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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.

Fixes: f5200aa983 ("coresight: perf: Refactor function free_event_data()")
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200928163513.70169-9-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tingwei Zhang 2020-09-28 10:34:56 -06:00 committed by Greg Kroah-Hartman
parent 8b0cf82677
commit 716f5652a1
1 changed files with 2 additions and 2 deletions
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4
drivers/hwtracing/coresight/coresight-etm-perf.c
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@ -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);