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perf/x86/intel/uncore: Fix wrong box pointer check 

Should not init a NULL box. It will cause system crash.
The issue looks like caused by a typo.

This was not noticed because there is no NULL box. Also, for most
boxes, they are enabled by default. The init code is not critical.

Fixes: fff4b87e59 ("perf/x86/intel/uncore: Make package handling more robust")
Signed-off-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20170629190926.2456-1-kan.liang@intel.com
This commit is contained in:
Kan Liang 2017-06-29 12:09:26 -07:00 committed by Thomas Gleixner
parent 98fe3633c5
commit 80c65fdb4c
1 changed files with 1 additions and 1 deletions
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2
arch/x86/events/intel/uncore.c
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@ -1170,7 +1170,7 @@ static int uncore_event_cpu_online(unsigned int cpu)
pmu = type->pmus;
for (i = 0; i < type->num_boxes; i++, pmu++) {
box = pmu->boxes[pkg];
if (!box && atomic_inc_return(&box->refcnt) == 1)
if (box && atomic_inc_return(&box->refcnt) == 1)
uncore_box_init(box);
}
}