[PATCH] mdio_bus: suppress err message for reset gpio EPROBE_DEFER

[Grygorii Strashko <grygorii.strashko@ti.com>]

The mdio_bus may have dependencies from GPIO controller and so got
deferred. Now it will print error message every time -EPROBE_DEFER is
returned from:
__mdiobus_register()
 |-devm_gpiod_get_optional()
without actually identifying error code.

"mdio_bus 4a101000.mdio: mii_bus 4a101000.mdio couldn't get reset GPIO"

Hence, suppress error message when devm_gpiod_get_optional() returning
-EPROBE_DEFER case.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
 drivers/net/phy/mdio_bus.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 757e950fb745..54fc13043656 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -546,10 +546,11 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner)
 	/* de-assert bus level PHY GPIO reset */
 	gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_LOW);
 	if (IS_ERR(gpiod)) {
-		dev_err(&bus->dev, "mii_bus %s couldn't get reset GPIO\n",
-			bus->id);
+		err = PTR_ERR(gpiod);
+		if (err != -EPROBE_DEFER)
+			dev_err(&bus->dev, "mii_bus %s couldn't get reset GPIO %d\n", bus->id, err);
 		device_del(&bus->dev);
-		return PTR_ERR(gpiod);
+		return err;
 	} else	if (gpiod) {
 		bus->reset_gpiod = gpiod;
 
-- 
2.17.1