1 files changed, 8 insertions, 4 deletions

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 600c1629b64d..58690af323e4 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2174,11 +2174,11 @@ static void perf_event_context_sched_in(struct perf_event_context *ctx,
          */
         cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
 
-        perf_event_sched_in(cpuctx, ctx, task);
-
         if (ctx->nr_events)
                 cpuctx->task_ctx = ctx;
 
+        perf_event_sched_in(cpuctx, cpuctx->task_ctx, task);
+
         perf_pmu_enable(ctx->pmu);
         perf_ctx_unlock(cpuctx, ctx);
 
@@ -3558,9 +3558,13 @@ static void ring_buffer_wakeup(struct perf_event *event)
 
         rcu_read_lock();
         rb = rcu_dereference(event->rb);
-        list_for_each_entry_rcu(event, &rb->event_list, rb_entry) {
+        if (!rb)
+                goto unlock;
+
+        list_for_each_entry_rcu(event, &rb->event_list, rb_entry)
                 wake_up_all(&event->waitq);
-        }
+
+unlock:
         rcu_read_unlock();
 }