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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, Geert Uytterhoeven <geert@linux-m68k.org>,
        Andrew Lunn <andrew@lunn.ch>,
        David Bauer <mail@david-bauer.net>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 5.4 18/46] mdio_bus: dont use managed reset-controller
Date:   Tue,  3 Dec 2019 23:35:38 +0100
Message-Id: <20191203212734.825000265@linuxfoundation.org>
In-Reply-To: <20191203212705.175425505@linuxfoundation.org>
References: <20191203212705.175425505@linuxfoundation.org>
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From: David Bauer <mail@david-bauer.net>

[ Upstream commit 32085f25d7b68404055f3525c780142fc72e543f ]

Geert Uytterhoeven reported that using devm_reset_controller_get leads
to a WARNING when probing a reset-controlled PHY. This is because the
device devm_reset_controller_get gets supplied is not actually the
one being probed.

Acquire an unmanaged reset-control as well as free the reset_control on
unregister to fix this.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
CC: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David Bauer <mail@david-bauer.net>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/phy/mdio_bus.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -62,8 +62,8 @@ static int mdiobus_register_reset(struct
 	struct reset_control *reset = NULL;
 
 	if (mdiodev->dev.of_node)
-		reset = devm_reset_control_get_exclusive(&mdiodev->dev,
-							 "phy");
+		reset = of_reset_control_get_exclusive(mdiodev->dev.of_node,
+						       "phy");
 	if (IS_ERR(reset)) {
 		if (PTR_ERR(reset) == -ENOENT || PTR_ERR(reset) == -ENOTSUPP)
 			reset = NULL;
@@ -107,6 +107,8 @@ int mdiobus_unregister_device(struct mdi
 	if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)
 		return -EINVAL;
 
+	reset_control_put(mdiodev->reset_ctrl);
+
 	mdiodev->bus->mdio_map[mdiodev->addr] = NULL;
 
 	return 0;