perf/arm-dmc620: Fix lockdep assert in ->event_init()
for_each_sibling_event() checks leader's ctx but it doesn't have the ctx
yet if it's the leader. Like in perf_event_validate_size(), we should
skip checking siblings in that case.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Fixes: f3c0eba287
("perf: Add a few assertions")
Reported-by: Greg Thelen <gthelen@google.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Tuan Phan <tuanphan@os.amperecomputing.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20240514180050.182454-1-namhyung@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
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parent
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@ -542,12 +542,16 @@ static int dmc620_pmu_event_init(struct perf_event *event)
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if (event->cpu < 0)
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return -EINVAL;
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hwc->idx = -1;
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if (event->group_leader == event)
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return 0;
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/*
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* We can't atomically disable all HW counters so only one event allowed,
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* although software events are acceptable.
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*/
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if (event->group_leader != event &&
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!is_software_event(event->group_leader))
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if (!is_software_event(event->group_leader))
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return -EINVAL;
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for_each_sibling_event(sibling, event->group_leader) {
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@ -556,7 +560,6 @@ static int dmc620_pmu_event_init(struct perf_event *event)
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return -EINVAL;
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}
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hwc->idx = -1;
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return 0;
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}
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