IPoIB: Fix kernel unaligned access on ia64
Fix misaligned access faults on ia64: never cast a misaligned
neighbour->ha + 4 pointer to union ib_gid type; pass a void * pointer
instead. The memcpy was being optimized to use full word accesses
because the compiler thought that union ib_gid is always aligned.
The cast in IPOIB_GID_ARG is safe, since it is fixed to access each
byte separately.
Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il>
Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index 1dae4b2..ec41c8f 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -154,7 +154,7 @@
return mcast;
}
-static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, union ib_gid *mgid)
+static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct rb_node *n = priv->multicast_tree.rb_node;
@@ -165,7 +165,7 @@
mcast = rb_entry(n, struct ipoib_mcast, rb_node);
- ret = memcmp(mgid->raw, mcast->mcmember.mgid.raw,
+ ret = memcmp(mgid, mcast->mcmember.mgid.raw,
sizeof (union ib_gid));
if (ret < 0)
n = n->rb_left;
@@ -694,8 +694,7 @@
return 0;
}
-void ipoib_mcast_send(struct net_device *dev, union ib_gid *mgid,
- struct sk_buff *skb)
+void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_mcast *mcast;
@@ -718,7 +717,7 @@
if (!mcast) {
/* Let's create a new send only group now */
ipoib_dbg_mcast(priv, "setting up send only multicast group for "
- IPOIB_GID_FMT "\n", IPOIB_GID_ARG(*mgid));
+ IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
mcast = ipoib_mcast_alloc(dev, 0);
if (!mcast) {
@@ -730,7 +729,7 @@
}
set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
- mcast->mcmember.mgid = *mgid;
+ memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
__ipoib_mcast_add(dev, mcast);
list_add_tail(&mcast->list, &priv->multicast_list);
}