Merge 3.5-rc4 into staging-next

[cascardo/linux.git] / kernel / events / core.c

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 5b06cbb..d7d71d6 100644 (file)
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -253,9 +253,9 @@ perf_cgroup_match(struct perf_event *event)
        return !event->cgrp || event->cgrp == cpuctx->cgrp;
 }
 
-static inline void perf_get_cgroup(struct perf_event *event)
+static inline bool perf_tryget_cgroup(struct perf_event *event)
 {
-       css_get(&event->cgrp->css);
+       return css_tryget(&event->cgrp->css);
 }
 
 static inline void perf_put_cgroup(struct perf_event *event)
@@ -484,7 +484,11 @@ static inline int perf_cgroup_connect(int fd, struct perf_event *event,
        event->cgrp = cgrp;
 
        /* must be done before we fput() the file */
-       perf_get_cgroup(event);
+       if (!perf_tryget_cgroup(event)) {
+               event->cgrp = NULL;
+               ret = -ENOENT;
+               goto out;
+       }
 
        /*
         * all events in a group must monitor
@@ -3181,7 +3185,6 @@ static void perf_event_for_each(struct perf_event *event,
        event = event->group_leader;
 
        perf_event_for_each_child(event, func);
-       func(event);
        list_for_each_entry(sibling, &event->sibling_list, group_entry)
                perf_event_for_each_child(sibling, func);
        mutex_unlock(&ctx->mutex);