linux-kernel - arc_pmu not initialized in the arc/kernel/perf

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Message-Id: <1434236946-15326-1-git-send-email-jcmvbkbc@gmail.com>
Date:	Sun, 14 Jun 2015 02:09:06 +0300
From:	Max Filippov <jcmvbkbc@...il.com>
To:	Mischa Jonker <mjonker@...opsys.com>,
	Vineet Gupta <vgupta@...opsys.com>
Cc:	linux-kernel@...r.kernel.org, Max Filippov <jcmvbkbc@...il.com>
Subject: arc_pmu not initialized in the arc/kernel/perf_event.c?

Mischa, Vineet,

Looking at ARC PMU driver I've got an impression that its static arc_pmu
is left uninitialized, which possibly leads to Oops once registered
callbacks are invoked. I don't have neither ARC toolchain nor hardware to
test it, so I may be missing something. Below is the fix for it.

Thanks.
-- Max

---8<---
From: Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH] arc: fix use of uninitialized arc_pmu

static arc_pmu in the arch/arc/kernel/perf_event.c is not initialized as
it's shadowed by a local variable of the same name in the
arc_pmu_device_probe.

Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
---
 arch/arc/kernel/perf_event.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c
index fd2ec50..57b58f5 100644
--- a/arch/arc/kernel/perf_event.c
+++ b/arch/arc/kernel/perf_event.c
@@ -266,7 +266,6 @@ static int arc_pmu_add(struct perf_event *event, int flags)
 
 static int arc_pmu_device_probe(struct platform_device *pdev)
 {
-	struct arc_pmu *arc_pmu;
 	struct arc_reg_pct_build pct_bcr;
 	struct arc_reg_cc_build cc_bcr;
 	int i, j, ret;
-- 
1.8.1.4
--
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