net: qcom/emac: grab a reference to the phydev on ACPI systems

Commit 6ffe1c4c ("net: qcom/emac: fix of_node and phydev leaks")
fixed the problem with reference leaks on phydev, but the fix is
device-tree specific.  When the driver unloads, the reference is
dropped only on DT systems.

Instead, it's cleaner if up grab an reference on ACPI systems.
When the driver unloads, we can drop the reference without having
to check whether we're on a DT system.
Signed-off-by: NTimur Tabi <timur@codeaurora.org>
Reviewed-by: NJohan Hovold <johan@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/qualcomm/emac/emac-phy.c

@@ -201,6 +201,13 @@ int emac_phy_config(struct platform_device *pdev, struct emac_adapter *adpt)
 		else
 			adpt->phydev = mdiobus_get_phy(mii_bus, phy_addr);
 
+		/* of_phy_find_device() claims a reference to the phydev,
+		 * so we do that here manually as well. When the driver
+		 * later unloads, it can unilaterally drop the reference
+		 * without worrying about ACPI vs DT.
+		 */
+		if (adpt->phydev)
+			get_device(&adpt->phydev->mdio.dev);
 	} else {
 		struct device_node *phy_np;
 

drivers/net/ethernet/qualcomm/emac/emac.c

@@ -719,8 +719,7 @@ static int emac_probe(struct platform_device *pdev)
 err_undo_napi:
 	netif_napi_del(&adpt->rx_q.napi);
 err_undo_mdiobus:
-	if (!has_acpi_companion(&pdev->dev))
-		put_device(&adpt->phydev->mdio.dev);
+	put_device(&adpt->phydev->mdio.dev);
 	mdiobus_unregister(adpt->mii_bus);
 err_undo_clocks:
 	emac_clks_teardown(adpt);
@@ -740,8 +739,7 @@ static int emac_remove(struct platform_device *pdev)
 
 	emac_clks_teardown(adpt);
 
-	if (!has_acpi_companion(&pdev->dev))
-		put_device(&adpt->phydev->mdio.dev);
+	put_device(&adpt->phydev->mdio.dev);
 	mdiobus_unregister(adpt->mii_bus);
 	free_netdev(netdev);