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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: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Sean Hefty 2005-11-30 10:01:13 -08:00 committed by Roland Dreier
parent 227eca8369
commit de1bb1a64c
1 changed files with 2 additions and 1 deletions
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3
drivers/infiniband/core/cm.c
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@ -308,10 +308,11 @@ static int cm_alloc_id(struct cm_id_private *cm_id_priv)
{ {
unsigned long flags; unsigned long flags;
int ret; int ret;
static int next_id;
do { do {
spin_lock_irqsave(&cm.lock, flags); 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); (__force int *) &cm_id_priv->id.local_id);
spin_unlock_irqrestore(&cm.lock, flags); spin_unlock_irqrestore(&cm.lock, flags);
} while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );