---

yaml --- r: 311196 b: refs/heads/master c: 9c5da09 h: refs/heads/master v: v3
git-mirror · Jun 18, 2012 · 03b0d67 · 03b0d67
1 parent 0544de4
commit 03b0d67
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Showing 2 changed files with 8 additions and 4 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8ed9eac4769407a8f0b93e381a3bc3ae81fa014b
+refs/heads/master: 9c5da09d266ca9b32eb16cf940f8161d949c2fe5
diff --git a/trunk/kernel/events/core.c b/trunk/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