3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wei Yongjun <yongjun_...@trendmicro.com.cn>

commit c481420248c6730246d2a1b1773d5d7007ae0835 upstream.

Fix to return -ENOMEM in the allocation error case instead of 0
(if pmu_bus_running == 1), as done elsewhere in this function.

Signed-off-by: Wei Yongjun <yongjun_...@trendmicro.com.cn>
Cc: a.p.zijls...@chello.nl
Cc: pau...@samba.org
Cc: a...@ghostprotocols.net
Link: 
http://lkml.kernel.org/r/capglhd8j_fwcgqe%3dklwjpbj%2b%3do0pw6z-seq%3dntpu08c2w1t...@mail.gmail.com
[ Tweaked the error code setting placement and the changelog. ]
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Cc: Rui Xiang <rui.xi...@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 kernel/events/core.c |    1 +
 1 file changed, 1 insertion(+)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5871,6 +5871,7 @@ skip_type:
        if (pmu->pmu_cpu_context)
                goto got_cpu_context;
 
+       ret = -ENOMEM;
        pmu->pmu_cpu_context = alloc_percpu(struct perf_cpu_context);
        if (!pmu->pmu_cpu_context)
                goto free_dev;


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