linux-kernel - [PATCH] mdio_bus: Fix init if CONFIG_RESET

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Date:   Tue, 19 Nov 2019 12:25:24 +0100
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     YueHaibing <yuehaibing@...wei.com>,
        "David S . Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] mdio_bus: Fix init if CONFIG_RESET_CONTROLLER=n

Commit 1d4639567d970de0 ("mdio_bus: Fix PTR_ERR applied after
initialization to constant") accidentally changed a check from -ENOTSUPP
to -ENOSYS, causing failures if reset controller support is not enabled.
E.g. on r7s72100/rskrza1:

    sh-eth e8203000.ethernet: MDIO init failed: -524
    sh-eth: probe of e8203000.ethernet failed with error -524

Fixes: 1d4639567d970de0 ("mdio_bus: Fix PTR_ERR applied after initialization to constant")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
This is a regression in v5.4-rc8.
Seen on r8a7740/armadillo, r7s72100/rskrza1, and r7s9210/rza2mevb.
---
 drivers/net/phy/mdio_bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 35876562e32a02ce..dbacb00318775ff1 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -65,7 +65,7 @@ static int mdiobus_register_reset(struct mdio_device *mdiodev)
 		reset = devm_reset_control_get_exclusive(&mdiodev->dev,
 							 "phy");
 	if (IS_ERR(reset)) {
-		if (PTR_ERR(reset) == -ENOENT || PTR_ERR(reset) == -ENOSYS)
+		if (PTR_ERR(reset) == -ENOENT || PTR_ERR(reset) == -ENOTSUPP)
 			reset = NULL;
 		else
 			return PTR_ERR(reset);
-- 
2.17.1