linux-kernel - [PATCH AUTOSEL for 4.9 053/281] mdio: mux: fix device_node

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Date:   Mon, 19 Mar 2018 15:58:52 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Julia Lawall <julia.lawall@...6.fr>,
        Jon Mason <jon.mason@...adcom.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 053/281] mdio: mux: fix
 device_node_continue.cocci warnings

From: Julia Lawall <julia.lawall@...6.fr>

[ Upstream commit 8c977f5a856a7276450ddf3a7b57b4a8815b63f9 ]

Device node iterators put the previous value of the index variable, so an
explicit put causes a double put.

In particular, of_mdiobus_register can fail before doing anything
interesting, so one could view it as a no-op from the reference count
point of view.

Generated by: scripts/coccinelle/iterators/device_node_continue.cocci

CC: Jon Mason <jon.mason@...adcom.com>
Signed-off-by: Julia Lawall <julia.lawall@...6.fr>
Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/net/phy/mdio-mux.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
index 6943c5ece44a..599ce24c514f 100644
--- a/drivers/net/phy/mdio-mux.c
+++ b/drivers/net/phy/mdio-mux.c
@@ -169,7 +169,6 @@ int mdio_mux_init(struct device *dev,
 		if (r) {
 			mdiobus_free(cb->mii_bus);
 			devm_kfree(dev, cb);
-			of_node_put(child_bus_node);
 		} else {
 			cb->next = pb->children;
 			pb->children = cb;
-- 
2.14.1