6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Namhyung Kim <namhyung@xxxxxxxxxx>
[ Upstream commit a4c5a457c6107dfe9dc65a104af1634811396bac ]
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@xxxxxxx>
Fixes: f3c0eba28704 ("perf: Add a few assertions")
Reported-by: Greg Thelen <gthelen@xxxxxxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
Cc: Tuan Phan <tuanphan@xxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx>
Link: https://lore.kernel.org/r/20240514180050.182454-1-namhyung@xxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 30cea68595747..b6a677224d682 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;
}
--
2.43.0
