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From: Dinh Nguyen <dinguyen@kernel.org>
To: davem@davemloft.net
Cc: dinguyen@kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-stable <stable@vger.kernel.org>
Subject: [PATCH] net: ethernet: stmmac: fix write to sgmii_adapter_base
Date: Wed, 20 Apr 2022 10:23:45 -0500	[thread overview]
Message-ID: <20220420152345.27415-1-dinguyen@kernel.org> (raw)

I made a mistake with the commit a6aaa0032424 ("net: ethernet: stmmac:
fix altr_tse_pcs function when using a fixed-link"). I should have
tested against both scenario of having a SGMII interface and one
without.

Without the SGMII PCS TSE adpater, the sgmii_adapter_base address is
NULL, thus a write to this address will fail.

Fixes: a6aaa0032424 ("net: ethernet: stmmac: fix altr_tse_pcs function when using a fixed-link")
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
index ac9e6c7a33b5..6b447d8f0bd8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
@@ -65,8 +65,9 @@ static void socfpga_dwmac_fix_mac_speed(void *priv, unsigned int speed)
 	struct phy_device *phy_dev = ndev->phydev;
 	u32 val;
 
-	writew(SGMII_ADAPTER_DISABLE,
-	       sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
+	if (sgmii_adapter_base)
+		writew(SGMII_ADAPTER_DISABLE,
+		       sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
 
 	if (splitter_base) {
 		val = readl(splitter_base + EMAC_SPLITTER_CTRL_REG);
@@ -88,10 +89,11 @@ static void socfpga_dwmac_fix_mac_speed(void *priv, unsigned int speed)
 		writel(val, splitter_base + EMAC_SPLITTER_CTRL_REG);
 	}
 
-	writew(SGMII_ADAPTER_ENABLE,
-	       sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
-	if (phy_dev)
+	if (phy_dev && sgmii_adapter_base) {
+		writew(SGMII_ADAPTER_ENABLE,
+		       sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
 		tse_pcs_fix_mac_speed(&dwmac->pcs, phy_dev, speed);
+	}
 }
 
 static int socfpga_dwmac_parse_data(struct socfpga_dwmac *dwmac, struct device *dev)
-- 
2.25.1


             reply	other threads:[~2022-04-20 15:23 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-20 15:23 Dinh Nguyen [this message]
2022-04-22 23:40 ` [PATCH] net: ethernet: stmmac: fix write to sgmii_adapter_base patchwork-bot+netdevbpf

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