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RDMA/cma: Protect against adding device during destruction 

Closes a window where address resolution can attach an rdma_cm_id to a
device during destruction of the rdma_cm_id.  This can result in the
rdma_cm_id remaining in the device list after its memory has been
freed.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
hifive-unleashed-5.1
Sean Hefty 2006-09-01 15:33:55 -07:00 committed by Roland Dreier
parent f94b533d09
commit 61a73c708f
1 changed files with 26 additions and 8 deletions
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34
drivers/infiniband/core/cma.c
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@ -279,7 +279,7 @@ static int cma_acquire_dev(struct rdma_id_private *id_priv)
default:
return -ENODEV;
}
mutex_lock(&lock);
list_for_each_entry(cma_dev, &dev_list, list) {
ret = ib_find_cached_gid(cma_dev->device, &gid,
&id_priv->id.port_num, NULL);
@ -288,7 +288,6 @@ static int cma_acquire_dev(struct rdma_id_private *id_priv)
break;
}
}
mutex_unlock(&lock);
return ret;
}
@ -712,7 +711,9 @@ void rdma_destroy_id(struct rdma_cm_id *id)
state = cma_exch(id_priv, CMA_DESTROYING);
cma_cancel_operation(id_priv, state);
mutex_lock(&lock);
if (id_priv->cma_dev) {
mutex_unlock(&lock);
switch (rdma_node_get_transport(id->device->node_type)) {
case RDMA_TRANSPORT_IB:
if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
@ -727,8 +728,8 @@ void rdma_destroy_id(struct rdma_cm_id *id)
}
mutex_lock(&lock);
cma_detach_from_dev(id_priv);
mutex_unlock(&lock);
}
mutex_unlock(&lock);
cma_release_port(id_priv);
cma_deref_id(id_priv);
@ -925,7 +926,9 @@ static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
}
atomic_inc(&conn_id->dev_remove);
mutex_lock(&lock);
ret = cma_acquire_dev(conn_id);
mutex_unlock(&lock);
if (ret) {
ret = -ENODEV;
cma_release_remove(conn_id);
@ -1097,7 +1100,9 @@ static int iw_conn_req_handler(struct iw_cm_id *cm_id,
goto out;
}
mutex_lock(&lock);
ret = cma_acquire_dev(conn_id);
mutex_unlock(&lock);
if (ret) {
cma_release_remove(conn_id);
rdma_destroy_id(new_cm_id);
@ -1507,16 +1512,26 @@ static void addr_handler(int status, struct sockaddr *src_addr,
enum rdma_cm_event_type event;
atomic_inc(&id_priv->dev_remove);
if (!id_priv->cma_dev && !status)
/*
* Grab mutex to block rdma_destroy_id() from removing the device while
* we're trying to acquire it.
*/
mutex_lock(&lock);
if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
mutex_unlock(&lock);
goto out;
}
if (!status && !id_priv->cma_dev)
status = cma_acquire_dev(id_priv);
mutex_unlock(&lock);
if (status) {
if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND))
if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
goto out;
event = RDMA_CM_EVENT_ADDR_ERROR;
} else {
if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED))
goto out;
memcpy(&id_priv->id.route.addr.src_addr, src_addr,
ip_addr_size(src_addr));
event = RDMA_CM_EVENT_ADDR_RESOLVED;
@ -1740,8 +1755,11 @@ int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
if (!cma_any_addr(addr)) {
ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
if (!ret)
if (!ret) {
mutex_lock(&lock);
ret = cma_acquire_dev(id_priv);
mutex_unlock(&lock);
}
if (ret)
goto err;
}