IB/iser: Seperate iser_conn and iscsi_endpoint storage space

iser connection needs asynchronous cleanup completions which are
triggered in ep_disconnect.  As a result we are keeping the
corresponding iscsi_endpoint structure hanging for no good reason. In
order to avoid that, we seperate iser_conn from iscsi_endpoint storage
space to have their destruction being independent.

iscsi_endpoint will be destroyed at ep_disconnect stage, while the
iser connection will wait for asynchronous completions to be released
in an orderly fashion.

Signed-off-by: Ariel Nahum <arieln@mellanox.com>
Signed-off-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

2 files changed, 14 insertions, 4 deletions

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index 1a53fd22aedf..d7acd4b62d6e 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -596,19 +596,28 @@ iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
         struct iser_conn *ib_conn;
         struct iscsi_endpoint *ep;
 
-        ep = iscsi_create_endpoint(sizeof(*ib_conn));
+        ep = iscsi_create_endpoint(0);
         if (!ep)
                 return ERR_PTR(-ENOMEM);
 
-        ib_conn = ep->dd_data;
+        ib_conn = kzalloc(sizeof(*ib_conn), GFP_KERNEL);
+        if (!ib_conn) {
+                err = -ENOMEM;
+                goto failure;
+        }
+
+        ep->dd_data = ib_conn;
         ib_conn->ep = ep;
         iser_conn_init(ib_conn);
 
         err = iser_connect(ib_conn, NULL, dst_addr, non_blocking);
         if (err)
-                return ERR_PTR(err);
+                goto failure;
 
         return ep;
+failure:
+        iscsi_destroy_endpoint(ep);
+        return ERR_PTR(err);
 }
 
 static int
@@ -658,6 +667,7 @@ iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
         } else {
                 iser_conn_release(ib_conn);
         }
+        iscsi_destroy_endpoint(ep);
 }
 
 static umode_t iser_attr_is_visible(int param_type, int param)
diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c
index 6c7d8ce7b016..fffb4ac4c6ac 100644
--- a/drivers/infiniband/ulp/iser/iser_verbs.c
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -620,7 +620,7 @@ void iser_conn_release(struct iser_conn *ib_conn)
                 rdma_destroy_id(ib_conn->cma_id);
                 ib_conn->cma_id = NULL;
         }
-        iscsi_destroy_endpoint(ib_conn->ep);
+        kfree(ib_conn);
 }
 
 /**