linux-kernel - [PATCH] perf/bts: Don't try handling BTS interrupt if BTS is not enabled

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Date:   Mon, 26 Sep 2016 15:19:06 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, x86@...nel.org
Cc:     alexander.shishkin@...ux.intel.com, peterz@...radead.org,
        bp@...e.de, linux-kernel@...r.kernel.org,
        boris.ostrovsky@...cle.com
Subject: [PATCH] perf/bts: Don't try handling BTS interrupt if BTS is not enabled

Otherwise we will try to dereference ds which has not been allocated.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
---
 arch/x86/events/intel/bts.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/events/intel/bts.c b/arch/x86/events/intel/bts.c
index bdcd651..1f5657f 100644
--- a/arch/x86/events/intel/bts.c
+++ b/arch/x86/events/intel/bts.c
@@ -451,6 +451,9 @@ int intel_bts_interrupt(void)
 	s64 old_head;
 	int err = -ENOSPC, handled = 0;
 
+	if (!x86_pmu.bts)
+		return 0;
+
 	/*
 	 * The only surefire way of knowing if this NMI is ours is by checking
 	 * the write ptr against the PMI threshold.
-- 
1.8.3.1