perf: Fix irq_work 'tail' recursion

[pandora-kernel.git] / kernel / events / core.c

diff --git a/kernel/events/core.c b/kernel/events/core.c
index f04daab..2fabc06 100644 (file)
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3591,7 +3591,7 @@ static void put_event(struct perf_event *event)
        ctx = perf_event_ctx_lock_nested(event, SINGLE_DEPTH_NESTING);
        WARN_ON_ONCE(ctx->parent_ctx);
        perf_remove_from_context(event, true);
-       mutex_unlock(&ctx->mutex);
+       perf_event_ctx_unlock(event, ctx);
 
        _free_event(event);
 }
@@ -4574,6 +4574,13 @@ static void perf_pending_event(struct irq_work *entry)
 {
        struct perf_event *event = container_of(entry,
                        struct perf_event, pending);
+       int rctx;
+
+       rctx = perf_swevent_get_recursion_context();
+       /*
+        * If we 'fail' here, that's OK, it means recursion is already disabled
+        * and we won't recurse 'further'.
+        */
 
        if (event->pending_disable) {
                event->pending_disable = 0;
@@ -4584,6 +4591,9 @@ static void perf_pending_event(struct irq_work *entry)
                event->pending_wakeup = 0;
                perf_event_wakeup(event);
        }
+
+       if (rctx >= 0)
+               perf_swevent_put_recursion_context(rctx);
 }
 
 /*