linux-kernel - [PATCH 4.4 276/312] net: ethernet: davinci_emac: Fix devioctl while in fixed link

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Date:   Fri,  8 May 2020 14:34:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Brian Hutchinson <b.hutchman@...il.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Mugunthan V N <mugunthanvnm@...com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 276/312] net: ethernet: davinci_emac: Fix devioctl while in fixed link

From: Neil Armstrong <narmstrong@...libre.com>

commit 62522ef3c399996f6c8120bfd14b94280bc9f490 upstream.

When configured in fixed link, the DaVinci emac driver sets the
priv->phydev to NULL and further ioctl calls to the phy_mii_ioctl()
causes the kernel to crash.

Cc: Brian Hutchinson <b.hutchman@...il.com>
Fixes: 1bb6aa56bb38 ("net: davinci_emac: Add support for fixed-link PHY")
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
Reviewed-by: Mugunthan V N <mugunthanvnm@...com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/ethernet/ti/davinci_emac.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -1512,7 +1512,10 @@ static int emac_devioctl(struct net_devi
 
 	/* TODO: Add phy read and write and private statistics get feature */
 
-	return phy_mii_ioctl(priv->phydev, ifrq, cmd);
+	if (priv->phydev)
+		return phy_mii_ioctl(priv->phydev, ifrq, cmd);
+	else
+		return -EOPNOTSUPP;
 }
 
 static int match_first_device(struct device *dev, void *data)