net: mvneta: Fix reference counting for phy_node

If there is a "phy" handle the probe function returns with holding a
reference to that node. Make sure that in the fixed phy case there is
also held a reference to yield a consistant state.

Also add the corresponding of_node_put in the error path and the remove
function.

Fixes: 83895bedeee6 ("net: mvneta: add support for fixed links")
Fixes: c5aff18204da ("net: mvneta: driver for Marvell Armada 370/XP network unit")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index dadd9a5f6323..c9f1d1b7ef37 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -2969,14 +2969,14 @@ static int mvneta_probe(struct platform_device *pdev)
                 /* In the case of a fixed PHY, the DT node associated
                  * to the PHY is the Ethernet MAC DT node.
                  */
-                phy_node = dn;
+                phy_node = of_node_get(dn);
         }
 
         phy_mode = of_get_phy_mode(dn);
         if (phy_mode < 0) {
                 dev_err(&pdev->dev, "incorrect phy-mode\n");
                 err = -EINVAL;
-                goto err_free_irq;
+                goto err_put_phy_node;
         }
 
         dev->tx_queue_len = MVNETA_MAX_TXD;
@@ -2992,7 +2992,7 @@ static int mvneta_probe(struct platform_device *pdev)
         pp->clk = devm_clk_get(&pdev->dev, NULL);
         if (IS_ERR(pp->clk)) {
                 err = PTR_ERR(pp->clk);
-                goto err_free_irq;
+                goto err_put_phy_node;
         }
 
         clk_prepare_enable(pp->clk);
@@ -3071,6 +3071,8 @@ err_free_stats:
         free_percpu(pp->stats);
 err_clk:
         clk_disable_unprepare(pp->clk);
+err_put_phy_node:
+        of_node_put(phy_node);
 err_free_irq:
         irq_dispose_mapping(dev->irq);
 err_free_netdev:
@@ -3088,6 +3090,7 @@ static int mvneta_remove(struct platform_device *pdev)
         clk_disable_unprepare(pp->clk);
         free_percpu(pp->stats);
         irq_dispose_mapping(dev->irq);
+        of_node_put(pp->phy_node);
         free_netdev(dev);
 
         return 0;