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IPoIB: Fix address handle refcounting for multicast groups

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Multiple ipoib_neigh structures on mcast->neigh_list may point to the
same ah.  This means that ipoib_mcast_free() can't just make a list of
ah structs to free, since this might end up trying to add the same ah
to the list more than once.  Handle this in ipoib_multicast.c in the
same way as it is handled in ipoib_main.c for struct ipoib_path.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Eli Cohen 2006-01-10 07:43:02 -08:00 committed by Roland Dreier
parent 70b4c8cdc1
commit 97460df37e
1 changed files with 7 additions and 6 deletions
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13
drivers/infiniband/ulp/ipoib/ipoib_multicast.c
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@ -97,8 +97,6 @@ static void ipoib_mcast_free(struct ipoib_mcast *mcast)
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_neigh *neigh, *tmp;
unsigned long flags;
LIST_HEAD(ah_list);
struct ipoib_ah *ah, *tah;
ipoib_dbg_mcast(netdev_priv(dev),
"deleting multicast group " IPOIB_GID_FMT "\n",
@ -107,8 +105,14 @@ static void ipoib_mcast_free(struct ipoib_mcast *mcast)
spin_lock_irqsave(&priv->lock, flags);
list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
/*
* It's safe to call ipoib_put_ah() inside priv->lock
* here, because we know that mcast->ah will always
* hold one more reference, so ipoib_put_ah() will
* never do more than decrement the ref count.
*/
if (neigh->ah)
list_add_tail(&neigh->ah->list, &ah_list);
ipoib_put_ah(neigh->ah);
*to_ipoib_neigh(neigh->neighbour) = NULL;
neigh->neighbour->ops->destructor = NULL;
kfree(neigh);
@ -116,9 +120,6 @@ static void ipoib_mcast_free(struct ipoib_mcast *mcast)
spin_unlock_irqrestore(&priv->lock, flags);
list_for_each_entry_safe(ah, tah, &ah_list, list)
ipoib_put_ah(ah);
if (mcast->ah)
ipoib_put_ah(mcast->ah);