[tip:perf/core] perf cgroup: Fix unmatched call to perf_detach_cgroup()

[tip-bot for Li Zefan]

Commit-ID:  f75e18cb9627b1d3d752b83a0b5563da0042c50a
Gitweb:     http://git.kernel.org/tip/f75e18cb9627b1d3d752b83a0b5563da0042c50a
Author:     Li Zefan <lizf@xxxxxxxxxxxxxx>
AuthorDate: Thu, 3 Mar 2011 14:25:50 +0800
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Fri, 4 Mar 2011 11:32:51 +0100

perf cgroup: Fix unmatched call to perf_detach_cgroup()

In the failure path, we call perf_detach_cgroup(), but we didn't
call perf_get_cgroup() prio to it.

Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
Acked-by: Stephane Eranian <eranian@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
LKML-Reference: <4D6F346E.9070606@xxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
 kernel/perf_event.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 7c999e8..b002095 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -412,6 +412,9 @@ static inline int perf_cgroup_connect(int fd, struct perf_event *event,
 	cgrp = container_of(css, struct perf_cgroup, css);
 	event->cgrp = cgrp;
 
+	/* must be done before we fput() the file */
+	perf_get_cgroup(event);
+
 	/*
 	 * all events in a group must monitor
 	 * the same cgroup because a task belongs
@@ -420,9 +423,6 @@ static inline int perf_cgroup_connect(int fd, struct perf_event *event,
 	if (group_leader && group_leader->cgrp != cgrp) {
 		perf_detach_cgroup(event);
 		ret = -EINVAL;
-	} else {
-		/* must be done before we fput() the file */
-		perf_get_cgroup(event);
 	}
 out:
 	fput_light(file, fput_needed);
--
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