linux-kernel - [PATCH 2/3] drivers/clocksource/pistachio: Fix memory corruption in init

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Date:   Fri, 26 Aug 2016 16:20:44 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     tglx@...utronix.de, mingo@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Marcin Nowakowski <marcin.nowakowski@...tec.com>
Subject: [PATCH 2/3] drivers/clocksource/pistachio: Fix memory corruption in init

From: Marcin Nowakowski <marcin.nowakowski@...tec.com>

Driver init code incorrectly uses the block base address and as a result
clears clocksource structure's fields instead of the hardware registers.

Commit 09a998201649 ("timekeeping: Lift clocksource cacheline
restriction") has changed the offsets within pistachio_clocksource
structure and what has previously gone unnoticed now leads to a kernel
panic during boot.

Signed-off-by: Marcin Nowakowski <marcin.nowakowski@...tec.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/time-pistachio.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/clocksource/time-pistachio.c b/drivers/clocksource/time-pistachio.c
index a7d9a08..a8e6c7d 100644
--- a/drivers/clocksource/time-pistachio.c
+++ b/drivers/clocksource/time-pistachio.c
@@ -202,10 +202,10 @@ static int __init pistachio_clksrc_of_init(struct device_node *node)
 	rate = clk_get_rate(fast_clk);
 
 	/* Disable irq's for clocksource usage */
-	gpt_writel(&pcs_gpt.base, 0, TIMER_IRQ_MASK, 0);
-	gpt_writel(&pcs_gpt.base, 0, TIMER_IRQ_MASK, 1);
-	gpt_writel(&pcs_gpt.base, 0, TIMER_IRQ_MASK, 2);
-	gpt_writel(&pcs_gpt.base, 0, TIMER_IRQ_MASK, 3);
+	gpt_writel(pcs_gpt.base, 0, TIMER_IRQ_MASK, 0);
+	gpt_writel(pcs_gpt.base, 0, TIMER_IRQ_MASK, 1);
+	gpt_writel(pcs_gpt.base, 0, TIMER_IRQ_MASK, 2);
+	gpt_writel(pcs_gpt.base, 0, TIMER_IRQ_MASK, 3);
 
 	/* Enable timer block */
 	writel(TIMER_ME_GLOBAL, pcs_gpt.base);
-- 
1.9.1