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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, Jose Abreu <joabreu@synopsys.com>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.2 090/162] net: stmmac: Fix issues when number of Queues >= 4
Date:   Tue, 27 Aug 2019 09:50:18 +0200
Message-Id: <20190827072741.294786459@linuxfoundation.org>
In-Reply-To: <20190827072738.093683223@linuxfoundation.org>
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[ Upstream commit e8df7e8c233a18d2704e37ecff47583b494789d3 ]

When queues >= 4 we use different registers but we were not subtracting
the offset of 4. Fix this.

Found out by Coverity.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c   | 4 ++++
 drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index e3850938cf2f3..d7bf0ad954b8c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -85,6 +85,8 @@ static void dwmac4_rx_queue_priority(struct mac_device_info *hw,
 	u32 value;
 
 	base_register = (queue < 4) ? GMAC_RXQ_CTRL2 : GMAC_RXQ_CTRL3;
+	if (queue >= 4)
+		queue -= 4;
 
 	value = readl(ioaddr + base_register);
 
@@ -102,6 +104,8 @@ static void dwmac4_tx_queue_priority(struct mac_device_info *hw,
 	u32 value;
 
 	base_register = (queue < 4) ? GMAC_TXQ_PRTY_MAP0 : GMAC_TXQ_PRTY_MAP1;
+	if (queue >= 4)
+		queue -= 4;
 
 	value = readl(ioaddr + base_register);
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
index 64b8cb88ea45d..d4bd99770f5d1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
@@ -106,6 +106,8 @@ static void dwxgmac2_rx_queue_prio(struct mac_device_info *hw, u32 prio,
 	u32 value, reg;
 
 	reg = (queue < 4) ? XGMAC_RXQ_CTRL2 : XGMAC_RXQ_CTRL3;
+	if (queue >= 4)
+		queue -= 4;
 
 	value = readl(ioaddr + reg);
 	value &= ~XGMAC_PSRQ(queue);
@@ -169,6 +171,8 @@ static void dwxgmac2_map_mtl_to_dma(struct mac_device_info *hw, u32 queue,
 	u32 value, reg;
 
 	reg = (queue < 4) ? XGMAC_MTL_RXQ_DMA_MAP0 : XGMAC_MTL_RXQ_DMA_MAP1;
+	if (queue >= 4)
+		queue -= 4;
 
 	value = readl(ioaddr + reg);
 	value &= ~XGMAC_QxMDMACH(queue);
-- 
2.20.1