From a4c5a457c6107dfe9dc65a104af1634811396bac Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Tue, 14 May 2024 11:00:50 -0700 Subject: [PATCH] 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 Fixes: f3c0eba28704 ("perf: Add a few assertions") Reported-by: Greg Thelen Cc: Robin Murphy Cc: Tuan Phan Signed-off-by: Namhyung Kim Reviewed-by: Robin Murphy Link: https://lore.kernel.org/r/20240514180050.182454-1-namhyung@kernel.org Signed-off-by: Will Deacon --- drivers/perf/arm_dmc620_pmu.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/perf/arm_dmc620_pmu.c b/drivers/perf/arm_dmc620_pmu.c index 2ec96e204c40..7e5f1d4fca0f 100644 --- a/drivers/perf/arm_dmc620_pmu.c +++ b/drivers/perf/arm_dmc620_pmu.c @@ -542,12 +542,16 @@ static int dmc620_pmu_event_init(struct perf_event *event) if (event->cpu < 0) return -EINVAL; + hwc->idx = -1; + + if (event->group_leader == event) + return 0; + /* * We can't atomically disable all HW counters so only one event allowed, * although software events are acceptable. */ - if (event->group_leader != event && - !is_software_event(event->group_leader)) + if (!is_software_event(event->group_leader)) return -EINVAL; for_each_sibling_event(sibling, event->group_leader) { @@ -556,7 +560,6 @@ static int dmc620_pmu_event_init(struct perf_event *event) return -EINVAL; } - hwc->idx = -1; return 0; }