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RDMA/cm: Make the destroy_id flow more robust

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Too much of the destruction is very carefully sensitive to the state
and various other things. Move more code to the unconditional path and
add several WARN_ONs to check consistency.

Link: https://lore.kernel.org/r/20200310092545.251365-5-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Jason Gunthorpe 2020-03-10 11:25:34 +02:00
parent bede86a39d
commit 2305d6864a
1 changed files with 8 additions and 5 deletions
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13
drivers/infiniband/core/cm.c
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@ -825,6 +825,8 @@ struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
cm_id_priv->id.context = context;
cm_id_priv->id.remote_cm_qpn = 1;
RB_CLEAR_NODE(&cm_id_priv->service_node);
RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
spin_lock_init(&cm_id_priv->lock);
init_completion(&cm_id_priv->comp);
INIT_LIST_HEAD(&cm_id_priv->work_list);
@ -982,11 +984,13 @@ static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
spin_lock_irq(&cm.lock);
if (--cm_id_priv->listen_sharecount > 0) {
/* The id is still shared. */
WARN_ON(refcount_read(&cm_id_priv->refcount) == 1);
cm_deref_id(cm_id_priv);
spin_unlock_irq(&cm.lock);
return;
}
rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
RB_CLEAR_NODE(&cm_id_priv->service_node);
spin_unlock_irq(&cm.lock);
break;
case IB_CM_SIDR_REQ_SENT:
@ -997,11 +1001,6 @@ static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
case IB_CM_SIDR_REQ_RCVD:
spin_unlock_irq(&cm_id_priv->lock);
cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
spin_lock_irq(&cm.lock);
if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
rb_erase(&cm_id_priv->sidr_id_node,
&cm.remote_sidr_table);
spin_unlock_irq(&cm.lock);
break;
case IB_CM_REQ_SENT:
case IB_CM_MRA_REQ_RCVD:
@ -1068,6 +1067,10 @@ static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
if (!list_empty(&cm_id_priv->prim_list) &&
(!cm_id_priv->prim_send_port_not_ready))
list_del(&cm_id_priv->prim_list);
WARN_ON(cm_id_priv->listen_sharecount);
WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node));
if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
spin_unlock(&cm.lock);
spin_unlock_irq(&cm_id_priv->lock);