Upstream reverted this commit (2c61e821da7a) and then used 6e4ff1c94a04 instead.

Marek

On Mon, 25 Nov 2019 14:28:31 +0100 gregkh@linuxfoundation.org wrote:

This is a note to let you know that I've just added the patch titled

mdio_bus: fix mdio_register_device when RESET_CONTROLLER is

disabled

to the 5.3-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: mdio_bus-fix-mdio_register_device-when-reset_controller-is-disabled.patch and it can be found in the queue-5.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Mon 25 Nov 2019 02:27:19 PM CET From: "Marek Behún" marek.behun@nic.cz Date: Mon, 18 Nov 2019 19:15:05 +0100 Subject: mdio_bus: fix mdio_register_device when RESET_CONTROLLER is disabled

From: "Marek Behún" marek.behun@nic.cz

[ Upstream commit 075e238d12c21c8bde700d21fb48be7a3aa80194 ]

When CONFIG_RESET_CONTROLLER is disabled, the devm_reset_control_get_exclusive function returns -ENOTSUPP. This is not handled in subsequent check and then the mdio device fails to probe.

When CONFIG_RESET_CONTROLLER is enabled, its code checks in OF for reset device, and since it is not present, returns -ENOENT. -ENOENT is handled. Add -ENOTSUPP also.

This happened to me when upgrading kernel on Turris Omnia. You either have to enable CONFIG_RESET_CONTROLLER or use this patch.

Signed-off-by: Marek Behún marek.behun@nic.cz Fixes: 71dd6c0dff51b ("net: phy: add support for reset-controller") Cc: Dmitry Torokhov dmitry.torokhov@gmail.com Cc: Andrew Lunn andrew@lunn.ch Cc: Andy Shevchenko andriy.shevchenko@linux.intel.com 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 | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/drivers/net/phy/mdio_bus.c +++ b/drivers/net/phy/mdio_bus.c @@ -68,11 +68,12 @@ static int mdiobus_register_reset(struct if (mdiodev->dev.of_node) reset = devm_reset_control_get_exclusive(&mdiodev->dev, "phy");

• if (PTR_ERR(reset) == -ENOENT ||

•    PTR_ERR(reset) == -ENOTSUPP)
  

• reset = NULL;
  

• else if (IS_ERR(reset))

• return PTR_ERR(reset);
  

• if (IS_ERR(reset)) {

• if (PTR_ERR(reset) == -ENOENT || PTR_ERR(reset) ==
  

-ENOTSUPP)

• 	reset = NULL;
  

• else
  

• 	return PTR_ERR(reset);
  

• }

mdiodev->reset_ctrl = reset;

Patches currently in stable-queue which might be from marek.behun@nic.cz are

queue-5.3/mdio_bus-fix-mdio_register_device-when-reset_controller-is-disabled.patch