linux-kernel - [PATCH 3.16 129/370] net: stmmac: Fix error path after register

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Message-ID: <lsq.1489146382.124620373@decadent.org.uk>
Date:   Fri, 10 Mar 2017 11:46:22 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Kweh, Hock Leong" <hock.leong.kweh@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Florian Fainelli" <f.fainelli@...il.com>
Subject: [PATCH 3.16 129/370] net: stmmac: Fix error path after
 register_netdev move

3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Florian Fainelli <f.fainelli@...il.com>

commit b2eb09af7370fedc6b9d9f05762f01625438467a upstream.

Commit 5701659004d6 ("net: stmmac: Fix race between stmmac_drv_probe and
stmmac_open") re-ordered how the MDIO bus registration and the network
device are registered, but missed to unwind the MDIO bus registration in
case we fail to register the network device.

Fixes: 5701659004d6 ("net: stmmac: Fix race between stmmac_drv_probe and stmmac_open")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Acked-by: Kweh, Hock Leong <hock.leong.kweh@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.16:
 - stmmac_dvr_probe() returns a pointer
 - 'pcs' is a member of struct stmmac_priv, not struct mac_device_info]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2794,12 +2794,19 @@ struct stmmac_priv *stmmac_dvr_probe(str
 	}
 
 	ret = register_netdev(ndev);
-	if (ret)
+	if (ret) {
 		netdev_err(priv->dev, "%s: ERROR %i registering the device\n",
 			   __func__, ret);
+		goto error_netdev_register;
+	}
 
-	return ret ? ERR_PTR(ret) : priv;
+	return priv;
 
+error_netdev_register:
+	if (priv->pcs != STMMAC_PCS_RGMII &&
+	    priv->pcs != STMMAC_PCS_TBI &&
+	    priv->pcs != STMMAC_PCS_RTBI)
+		stmmac_mdio_unregister(ndev);
 error_mdio_register:
 	netif_napi_del(&priv->napi);
 error_hw_init: