diff options
Diffstat (limited to 'kernel/events/core.c')
| -rw-r--r-- | kernel/events/core.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 318ff7b021b4..10ed2cd434dc 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -3200,16 +3200,36 @@ static int perf_event_modify_breakpoint(struct perf_event *bp, static int perf_event_modify_attr(struct perf_event *event, struct perf_event_attr *attr) { + int (*func)(struct perf_event *, struct perf_event_attr *); + struct perf_event *child; + int err; + if (event->attr.type != attr->type) return -EINVAL; switch (event->attr.type) { case PERF_TYPE_BREAKPOINT: - return perf_event_modify_breakpoint(event, attr); + func = perf_event_modify_breakpoint; + break; default: /* Place holder for future additions. */ return -EOPNOTSUPP; } + + WARN_ON_ONCE(event->ctx->parent_ctx); + + mutex_lock(&event->child_mutex); + err = func(event, attr); + if (err) + goto out; + list_for_each_entry(child, &event->child_list, child_list) { + err = func(child, attr); + if (err) + goto out; + } +out: + mutex_unlock(&event->child_mutex); + return err; } static void ctx_sched_out(struct perf_event_context *ctx, |