[GIT PULL] perf fix

[Ingo Molnar]

Linus,

Please pull the latest perf-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 
perf-urgent-for-linus

   # HEAD: 2eece390bf68ec8f733d7e4a3ba8a5ea350082ae perf/x86/intel/bts: Fix 
exclusive event reference leak

A fix for a misplaced permission check that can leave perf PT or LBR disabled 
(on 
Intel CPUs) permanently until the next reboot.

 Thanks,

        Ingo

------------------>
Alexander Shishkin (1):
      perf/x86/intel/bts: Fix exclusive event reference leak


 arch/x86/events/intel/bts.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/events/intel/bts.c b/arch/x86/events/intel/bts.c
index 16076eb34699..141e07b06216 100644
--- a/arch/x86/events/intel/bts.c
+++ b/arch/x86/events/intel/bts.c
@@ -546,9 +546,6 @@ static int bts_event_init(struct perf_event *event)
        if (event->attr.type != bts_pmu.type)
                return -ENOENT;
 
-       if (x86_add_exclusive(x86_lbr_exclusive_bts))
-               return -EBUSY;
-
        /*
         * BTS leaks kernel addresses even when CPL0 tracing is
         * disabled, so disallow intel_bts driver for unprivileged
@@ -562,6 +559,9 @@ static int bts_event_init(struct perf_event *event)
            !capable(CAP_SYS_ADMIN))
                return -EACCES;
 
+       if (x86_add_exclusive(x86_lbr_exclusive_bts))
+               return -EBUSY;
+
        ret = x86_reserve_hardware();
        if (ret) {
                x86_del_exclusive(x86_lbr_exclusive_bts);