netdev - [RFC PATCH 01/16] dsa: slave: chip data is optional, don't dereference NULL

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Message-Id: <1464312050-23023-2-git-send-email-andrew@lunn.ch>
Date:	Fri, 27 May 2016 03:20:35 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	netdev <netdev@...r.kernel.org>
Cc:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	John Crispin <john@...ozen.org>, Bryan.Whitehead@...rochip.com,
	Andrew Lunn <andrew@...n.ch>
Subject: [RFC PATCH 01/16] dsa: slave: chip data is optional, don't dereference NULL

The new binding does not make use of dsa_chip_data, a.k.a cd.  When
retrieving the size of the EEPROM attached to a switch, don't assume
there is a cd attached to the switch structure.

Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
 net/dsa/slave.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 152436cdab30..135a91706755 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -615,7 +615,7 @@ static int dsa_slave_get_eeprom_len(struct net_device *dev)
 	struct dsa_slave_priv *p = netdev_priv(dev);
 	struct dsa_switch *ds = p->parent;
 
-	if (ds->cd->eeprom_len)
+	if (ds->cd && ds->cd->eeprom_len)
 		return ds->cd->eeprom_len;
 
 	if (ds->drv->get_eeprom_len)
-- 
2.8.1