linux-kernel - [PATCH v2 3/3] soc: amazon: al-pos: cast to u64 before left shifting

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Message-ID: <1568142310-17622-4-git-send-email-talel@amazon.com>
Date:   Tue, 10 Sep 2019 22:05:10 +0300
From:   Talel Shenhar <talel@...zon.com>
To:     <robh+dt@...nel.org>, <marc.zyngier@....com>, <tglx@...utronix.de>,
        <jason@...edaemon.net>, <mark.rutland@....com>,
        <nicolas.ferre@...rochip.com>, <mchehab+samsung@...nel.org>,
        <shawn.lin@...k-chips.com>, <gregkh@...uxfoundation.org>,
        <dwmw@...zon.co.uk>, <benh@...nel.crashing.org>,
        <talel@...zon.com>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: [PATCH v2 3/3] soc: amazon: al-pos: cast to u64 before left shifting

Fix wrap around for pos errors on addresses above 32 bit.

Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Talel Shenhar <talel@...zon.com>
---
 drivers/soc/amazon/al_pos.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/amazon/al_pos.c b/drivers/soc/amazon/al_pos.c
index a865111..e95e1fc 100644
--- a/drivers/soc/amazon/al_pos.c
+++ b/drivers/soc/amazon/al_pos.c
@@ -49,7 +49,7 @@ static irqreturn_t al_pos_irq_handler(int irq, void *info)
 	writel(0, pos->mmio_base + AL_POS_ERROR_LOG_1);
 
 	addr = FIELD_GET(AL_POS_ERROR_LOG_0_ADDR_LOW, log0);
-	addr |= (FIELD_GET(AL_POS_ERROR_LOG_1_ADDR_HIGH, log1) << 32);
+	addr |= (((u64)FIELD_GET(AL_POS_ERROR_LOG_1_ADDR_HIGH, log1)) << 32);
 	request_id = FIELD_GET(AL_POS_ERROR_LOG_1_REQUEST_ID, log1);
 	bresp = FIELD_GET(AL_POS_ERROR_LOG_1_BRESP, log1);
 
-- 
2.7.4