netdev - [PATCH net] Revert "net: mdio_bus: Use devm for getting reset GPIO"

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Message-ID: <20250801212742.2607149-1-kuba@kernel.org>
Date: Fri,  1 Aug 2025 14:27:42 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	andrew+netdev@...n.ch,
	horms@...nel.org,
	Jakub Kicinski <kuba@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
	andrew@...n.ch,
	hkallweit1@...il.com,
	linux@...linux.org.uk,
	csokas.bence@...lan.hu,
	geert@...ux-m68k.org
Subject: [PATCH net] Revert "net: mdio_bus: Use devm for getting reset GPIO"

This reverts commit 3b98c9352511db627b606477fc7944b2fa53a165.

Russell says:

  Using devm_*() [here] is completely wrong, because this is called
  from mdiobus_register_device(). This is not the probe function
  for the device, and thus there is no code to trigger the release of
  the resource on unregistration.

  Moreover, when the mdiodev is eventually probed, if the driver fails
  or the driver is unbound, the GPIO will be released, but a reference
  will be left behind.

  Using devm* with a struct device that is *not* currently being probed
  is fundamentally wrong - an abuse of devm.

Reported-by: Mark Brown <broonie@...nel.org>
Link: https://lore.kernel.org/95449490-fa58-41d4-9493-c9213c1f2e7d@sirena.org.uk
Suggested-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Fixes: 3b98c9352511 ("net: mdio_bus: Use devm for getting reset GPIO")
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: andrew@...n.ch
CC: hkallweit1@...il.com
CC: linux@...linux.org.uk
CC: csokas.bence@...lan.hu
CC: geert@...ux-m68k.org
---
 drivers/net/phy/mdio_bus.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 24bdab5bdd24..fda2e27c1810 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -36,8 +36,8 @@
 static int mdiobus_register_gpiod(struct mdio_device *mdiodev)
 {
 	/* Deassert the optional reset signal */
-	mdiodev->reset_gpio = devm_gpiod_get_optional(&mdiodev->dev,
-						      "reset", GPIOD_OUT_LOW);
+	mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev,
+						 "reset", GPIOD_OUT_LOW);
 	if (IS_ERR(mdiodev->reset_gpio))
 		return PTR_ERR(mdiodev->reset_gpio);
 
-- 
2.50.1