Commit de1bb1a6 authored by Sean Hefty's avatar Sean Hefty Committed by Roland Dreier

IB/cm: avoid reusing local ID

Use an increasing local ID to avoid re-using identifiers while
messages may still be outstanding on the old ID.  Without this, a
quick connect-disconnect-connect sequence can fail by matching
messages for the new connection with the old connection.
Signed-off-by: default avatarSean Hefty <>
Signed-off-by: default avatarRoland Dreier <>
parent 227eca83
......@@ -308,10 +308,11 @@ static int cm_alloc_id(struct cm_id_private *cm_id_priv)
unsigned long flags;
int ret;
static int next_id;
do {
spin_lock_irqsave(&cm.lock, flags);
ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 1,
ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, next_id++,
(__force int *) &cm_id_priv->id.local_id);
spin_unlock_irqrestore(&cm.lock, flags);
} while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
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