RDMA/rdma_cm: Delete rdma_addr_client

The only thing it does is block module unload while work is posted from
rdma_resolve_ip().

However, this is not the right place to do this. The users of
rdma_resolve_ip() must ensure their own module does not unload until
rdma_resolve_ip() calls the callback, or until rdma_addr_cancel() is
called.

Similarly callers to rdma_addr_find_l2_eth_by_grh() must ensure their
module does not unload while they are calling code.

The only two users are already safe, so there is no need for this.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 9756cfb..4f32c40 100644 (file)
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -56,7 +56,6 @@ struct addr_req {
        struct sockaddr_storage src_addr;
        struct sockaddr_storage dst_addr;
        struct rdma_dev_addr *addr;
-       struct rdma_addr_client *client;
        void *context;
        void (*callback)(int status, struct sockaddr *src_addr,
                         struct rdma_dev_addr *addr, void *context);
@@ -220,28 +219,6 @@ int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr)
 }
 EXPORT_SYMBOL(rdma_addr_size_kss);
 
-static struct rdma_addr_client self;
-
-void rdma_addr_register_client(struct rdma_addr_client *client)
-{
-       atomic_set(&client->refcount, 1);
-       init_completion(&client->comp);
-}
-EXPORT_SYMBOL(rdma_addr_register_client);
-
-static inline void put_client(struct rdma_addr_client *client)
-{
-       if (atomic_dec_and_test(&client->refcount))
-               complete(&client->comp);
-}
-
-void rdma_addr_unregister_client(struct rdma_addr_client *client)
-{
-       put_client(client);
-       wait_for_completion(&client->comp);
-}
-EXPORT_SYMBOL(rdma_addr_unregister_client);
-
 void rdma_copy_addr(struct rdma_dev_addr *dev_addr,
                    const struct net_device *dev,
                    const unsigned char *dst_dev_addr)
@@ -605,14 +582,12 @@ static void process_one_req(struct work_struct *_work)
                 */
                cancel_delayed_work(&req->work);
                list_del_init(&req->list);
-               put_client(req->client);
                kfree(req);
        }
        spin_unlock_bh(&lock);
 }
 
-int rdma_resolve_ip(struct rdma_addr_client *client,
-                   struct sockaddr *src_addr, struct sockaddr *dst_addr,
+int rdma_resolve_ip(struct sockaddr *src_addr, struct sockaddr *dst_addr,
                    struct rdma_dev_addr *addr, int timeout_ms,
                    void (*callback)(int status, struct sockaddr *src_addr,
                                     struct rdma_dev_addr *addr, void *context),
@@ -644,8 +619,6 @@ int rdma_resolve_ip(struct rdma_addr_client *client,
        req->addr = addr;
        req->callback = callback;
        req->context = context;
-       req->client = client;
-       atomic_inc(&client->refcount);
        INIT_DELAYED_WORK(&req->work, process_one_req);
        req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
 
@@ -661,7 +634,6 @@ int rdma_resolve_ip(struct rdma_addr_client *client,
                break;
        default:
                ret = req->status;
-               atomic_dec(&client->refcount);
                goto err;
        }
        return ret;
@@ -722,7 +694,6 @@ void rdma_addr_cancel(struct rdma_dev_addr *addr)
                found->callback(-ECANCELED, (struct sockaddr *)&found->src_addr,
                              found->addr, found->context);
 
-       put_client(found->client);
        kfree(found);
 }
 EXPORT_SYMBOL(rdma_addr_cancel);
@@ -761,8 +732,8 @@ int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
        dev_addr.net = &init_net;
 
        init_completion(&ctx.comp);
-       ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr,
-                       &dev_addr, 1000, resolve_cb, &ctx);
+       ret = rdma_resolve_ip(&sgid_addr._sockaddr, &dgid_addr._sockaddr,
+                             &dev_addr, 1000, resolve_cb, &ctx);
        if (ret)
                return ret;
 
@@ -806,14 +777,13 @@ int addr_init(void)
                return -ENOMEM;
 
        register_netevent_notifier(&nb);
-       rdma_addr_register_client(&self);
 
        return 0;
 }
 
 void addr_cleanup(void)
 {
-       rdma_addr_unregister_client(&self);
        unregister_netevent_notifier(&nb);
        destroy_workqueue(addr_wq);
+       WARN_ON(!list_empty(&req_list));
 }

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 51a6410..4830083 100644 (file)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -156,7 +156,6 @@ static struct ib_client cma_client = {
 };
 
 static struct ib_sa_client sa_client;
-static struct rdma_addr_client addr_client;
 static LIST_HEAD(dev_list);
 static LIST_HEAD(listen_any_list);
 static DEFINE_MUTEX(lock);
@@ -2910,7 +2909,7 @@ int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
                if (dst_addr->sa_family == AF_IB) {
                        ret = cma_resolve_ib_addr(id_priv);
                } else {
-                       ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
+                       ret = rdma_resolve_ip(cma_src_addr(id_priv),
                                              dst_addr, &id->route.addr.dev_addr,
                                              timeout_ms, addr_handler, id_priv);
                }
@@ -4547,7 +4546,6 @@ static int __init cma_init(void)
                goto err_wq;
 
        ib_sa_register_client(&sa_client);
-       rdma_addr_register_client(&addr_client);
        register_netdevice_notifier(&cma_nb);
 
        ret = ib_register_client(&cma_client);
@@ -4561,7 +4559,6 @@ static int __init cma_init(void)
 
 err:
        unregister_netdevice_notifier(&cma_nb);
-       rdma_addr_unregister_client(&addr_client);
        ib_sa_unregister_client(&sa_client);
 err_wq:
        destroy_workqueue(cma_wq);
@@ -4574,7 +4571,6 @@ static void __exit cma_cleanup(void)
        rdma_nl_unregister(RDMA_NL_RDMA_CM);
        ib_unregister_client(&cma_client);
        unregister_netdevice_notifier(&cma_nb);
-       rdma_addr_unregister_client(&addr_client);
        ib_sa_unregister_client(&sa_client);
        unregister_pernet_subsys(&cma_pernet_operations);
        destroy_workqueue(cma_wq);

diff --git a/include/rdma/ib_addr.h b/include/rdma/ib_addr.h
index a08cc72..c2c8b1f 100644 (file)
--- a/include/rdma/ib_addr.h
+++ b/include/rdma/ib_addr.h
@@ -49,22 +49,6 @@
 #include <net/ipv6.h>
 #include <net/net_namespace.h>
 
-struct rdma_addr_client {
-       atomic_t refcount;
-       struct completion comp;
-};
-
-/**
- * rdma_addr_register_client - Register an address client.
- */
-void rdma_addr_register_client(struct rdma_addr_client *client);
-
-/**
- * rdma_addr_unregister_client - Deregister an address client.
- * @client: Client object to deregister.
- */
-void rdma_addr_unregister_client(struct rdma_addr_client *client);
-
 /**
  * struct rdma_dev_addr - Contains resolved RDMA hardware addresses
  * @src_dev_addr:      Source MAC address.
@@ -99,7 +83,6 @@ int rdma_translate_ip(const struct sockaddr *addr,
 /**
  * rdma_resolve_ip - Resolve source and destination IP addresses to
  *   RDMA hardware addresses.
- * @client: Address client associated with request.
  * @src_addr: An optional source address to use in the resolution.  If a
  *   source address is not provided, a usable address will be returned via
  *   the callback.
@@ -112,8 +95,7 @@ int rdma_translate_ip(const struct sockaddr *addr,
  *   or been canceled.  A status of 0 indicates success.
  * @context: User-specified context associated with the call.
  */
-int rdma_resolve_ip(struct rdma_addr_client *client,
-                   struct sockaddr *src_addr, struct sockaddr *dst_addr,
+int rdma_resolve_ip(struct sockaddr *src_addr, struct sockaddr *dst_addr,
                    struct rdma_dev_addr *addr, int timeout_ms,
                    void (*callback)(int status, struct sockaddr *src_addr,
                                     struct rdma_dev_addr *addr, void *context),