linux-kernel - [PATCH 5.4 025/434] net: stmmac: platform: Fix MDIO init for platforms without PHY

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Date:   Sun, 29 Dec 2019 18:21:18 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jayati Sahu <jayati.sahu@...sung.com>,
        Sriram Dash <sriram.dash@...sung.com>,
        Padmanabhan Rajanbabu <p.rajanbabu@...sung.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.4 025/434] net: stmmac: platform: Fix MDIO init for platforms without PHY

From: Padmanabhan Rajanbabu <p.rajanbabu@...sung.com>

[ Upstream commit d3e014ec7d5ebe9644b5486bc530b91e62bbf624 ]

The current implementation of "stmmac_dt_phy" function initializes
the MDIO platform bus data, even in the absence of PHY. This fix
will skip MDIO initialization if there is no PHY present.

Fixes: 7437127 ("net: stmmac: Convert to phylink and remove phylib logic")
Acked-by: Jayati Sahu <jayati.sahu@...sung.com>
Signed-off-by: Sriram Dash <sriram.dash@...sung.com>
Signed-off-by: Padmanabhan Rajanbabu <p.rajanbabu@...sung.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -320,7 +320,7 @@ out:
 static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
 			 struct device_node *np, struct device *dev)
 {
-	bool mdio = true;
+	bool mdio = false;
 	static const struct of_device_id need_mdio_ids[] = {
 		{ .compatible = "snps,dwc-qos-ethernet-4.10" },
 		{},