diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/core.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 816f83d70fc6..5d8f4031f8d5 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -9199,7 +9199,13 @@ static int perf_try_init_event(struct pmu *pmu, struct perf_event *event) if (!try_module_get(pmu->module)) return -ENODEV; - if (event->group_leader != event) { + /* + * A number of pmu->event_init() methods iterate the sibling_list to, + * for example, validate if the group fits on the PMU. Therefore, + * if this is a sibling event, acquire the ctx->mutex to protect + * the sibling_list. + */ + if (event->group_leader != event && pmu->task_ctx_nr != perf_sw_context) { /* * This ctx->mutex can nest when we're called through * inheritance. See the perf_event_ctx_lock_nested() comment. |