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mdio_bus: don't use managed reset-controller

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[ 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>
This commit is contained in:
David Bauer 2019-11-22 22:44:51 +01:00 • committed by Greg Kroah-Hartman
commit 72e08c098e
1 changed files with 4 additions and 2 deletions
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6
drivers/net/phy/mdio_bus.c
View file

@ -62,8 +62,8 @@ static int mdiobus_register_reset(struct mdio_device *mdiodev)
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 mdio_device *mdiodev)
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;