net: ftgmac100: Hold reference returned by of_get_child_by_name()

[ Upstream commit 49b9f431ff0d845a36be0b3ede35ec324f2e5fee ]

In ftgmac100_probe(), we should hold the refernece returned by
of_get_child_by_name() and use it to call of_node_put() for
reference balance.

Fixes: 39bfab8844a0 ("net: ftgmac100: Add support for DT phy-handle property")
Signed-off-by: Liang He <windhl@126.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 0b833572205f39105669ab2dea71788e8e194b58..4a2dadb91f02490033c19158cc7202158d08daeb 100644 (file)
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -1746,6 +1746,19 @@ cleanup_clk:
        return rc;
 }
 
+static bool ftgmac100_has_child_node(struct device_node *np, const char *name)
+{
+       struct device_node *child_np = of_get_child_by_name(np, name);
+       bool ret = false;
+
+       if (child_np) {
+               ret = true;
+               of_node_put(child_np);
+       }
+
+       return ret;
+}
+
 static int ftgmac100_probe(struct platform_device *pdev)
 {
        struct resource *res;
@@ -1865,7 +1878,7 @@ static int ftgmac100_probe(struct platform_device *pdev)
 
                /* Display what we found */
                phy_attached_info(phy);
-       } else if (np && !of_get_child_by_name(np, "mdio")) {
+       } else if (np && !ftgmac100_has_child_node(np, "mdio")) {
                /* Support legacy ASPEED devicetree descriptions that decribe a
                 * MAC with an embedded MDIO controller but have no "mdio"
                 * child node. Automatically scan the MDIO bus for available