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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Petr Cvek <petrcvekcz@gmail.com>,
        Paul Burton <paul.burton@mips.com>, hauke@hauke-m.de,
        john@phrozen.org, linux-mips@vger.kernel.org,
        openwrt-devel@lists.openwrt.org, pakahmar@hotmail.com,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.2 019/131] MIPS: lantiq: Fix bitfield masking
Date:   Mon,  5 Aug 2019 15:01:46 +0200
Message-Id: <20190805124952.718096980@linuxfoundation.org>
In-Reply-To: <20190805124951.453337465@linuxfoundation.org>
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[ Upstream commit ba1bc0fcdeaf3bf583c1517bd2e3e29cf223c969 ]

The modification of EXIN register doesn't clean the bitfield before
the writing of a new value. After a few modifications the bitfield would
accumulate only '1's.

Signed-off-by: Petr Cvek <petrcvekcz@gmail.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: hauke@hauke-m.de
Cc: john@phrozen.org
Cc: linux-mips@vger.kernel.org
Cc: openwrt-devel@lists.openwrt.org
Cc: pakahmar@hotmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/mips/lantiq/irq.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/mips/lantiq/irq.c b/arch/mips/lantiq/irq.c
index cfd87e662fcf4..9c95097557c75 100644
--- a/arch/mips/lantiq/irq.c
+++ b/arch/mips/lantiq/irq.c
@@ -154,8 +154,9 @@ static int ltq_eiu_settype(struct irq_data *d, unsigned int type)
 			if (edge)
 				irq_set_handler(d->hwirq, handle_edge_irq);
 
-			ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_C) |
-				(val << (i * 4)), LTQ_EIU_EXIN_C);
+			ltq_eiu_w32((ltq_eiu_r32(LTQ_EIU_EXIN_C) &
+				    (~(7 << (i * 4)))) | (val << (i * 4)),
+				    LTQ_EIU_EXIN_C);
 		}
 	}
 
-- 
2.20.1