Re: [ofa-general] [PATCH] IB/ipoib: Fix undefined symbol (priv->cm) if ipoib_cm disabled

[Roland Dreier <rdreier@cisco.com>]

Thanks a lot for pointing this out!  I rolled the following into the
offending patch in my tree instead (I preferred avoiding #ifdefs in .c
files...)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 545c5a3..fe250c6 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -505,6 +505,12 @@ static inline int ipoib_cm_has_srq(struct net_device *dev)
 	return !!priv->cm.srq;
 }
 
+static inline unsigned int ipoib_cm_max_mtu(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	return priv->cm.max_cm_mtu;
+}
+
 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx);
 int ipoib_cm_dev_open(struct net_device *dev);
 void ipoib_cm_dev_stop(struct net_device *dev);
@@ -554,6 +560,11 @@ static inline int ipoib_cm_has_srq(struct net_device *dev)
 	return 0;
 }
 
+static inline unsigned int ipoib_cm_max_mtu(struct net_device *dev)
+{
+	return 0;
+}
+
 static inline
 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
 {
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index e499626..d733045 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -183,7 +183,7 @@ static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 
 	/* dev->mtu > 2K ==> connected mode */
 	if (ipoib_cm_admin_enabled(dev)) {
-		if (new_mtu > priv->cm.max_cm_mtu)
+		if (new_mtu > ipoib_cm_max_mtu(dev))
 			return -EINVAL;
 
 		if (new_mtu > priv->mcast_mtu)