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iser-target: release stale iser connections 

When receiving a new iser connect request we serialize
the pending requests by adding the newly created iser connection
to the np accept list and let the login thread process the connect
request one by one (np_accept_wait).

In case we received a disconnect request before the iser_conn
has begun processing (still linked in np_accept_list) we should
detach it from the list and clean it up and not have the login
thread process a stale connection. We do it only when the connection
state is not already terminating (initiator driven disconnect) as
this might lead us to access np_accept_mutex after the np was released
in live shutdown scenarios.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Jenny Falkovich <jennyf@mellanox.com>
Cc: stable@vger.kernel.org # 3.10+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Sagi Grimberg 2015-06-04 19:49:20 +03:00 committed by Nicholas Bellinger
parent 9253e667ab
commit 2f1b6b7d9a
1 changed files with 17 additions and 1 deletions
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18
drivers/infiniband/ulp/isert/ib_isert.c
View File

@ -65,6 +65,8 @@ static int
isert_rdma_accept(struct isert_conn *isert_conn);
struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
static void isert_release_work(struct work_struct *work);
static inline bool
isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
{
@ -648,6 +650,7 @@ isert_init_conn(struct isert_conn *isert_conn)
mutex_init(&isert_conn->mutex);
spin_lock_init(&isert_conn->pool_lock);
INIT_LIST_HEAD(&isert_conn->fr_pool);
INIT_WORK(&isert_conn->release_work, isert_release_work);
}
static void
@ -925,6 +928,7 @@ isert_disconnected_handler(struct rdma_cm_id *cma_id,
{
struct isert_np *isert_np = cma_id->context;
struct isert_conn *isert_conn;
bool terminating = false;
if (isert_np->np_cm_id == cma_id)
return isert_np_cma_handler(cma_id->context, event);
@ -932,12 +936,25 @@ isert_disconnected_handler(struct rdma_cm_id *cma_id,
isert_conn = cma_id->qp->qp_context;
mutex_lock(&isert_conn->mutex);
terminating = (isert_conn->state == ISER_CONN_TERMINATING);
isert_conn_terminate(isert_conn);
mutex_unlock(&isert_conn->mutex);
isert_info("conn %p completing wait\n", isert_conn);
complete(&isert_conn->wait);
if (terminating)
goto out;
mutex_lock(&isert_np->np_accept_mutex);
if (!list_empty(&isert_conn->accept_node)) {
list_del_init(&isert_conn->accept_node);
isert_put_conn(isert_conn);
queue_work(isert_release_wq, &isert_conn->release_work);
}
mutex_unlock(&isert_np->np_accept_mutex);
out:
return 0;
}
@ -3368,7 +3385,6 @@ static void isert_wait_conn(struct iscsi_conn *conn)
isert_wait4flush(isert_conn);
isert_wait4logout(isert_conn);
INIT_WORK(&isert_conn->release_work, isert_release_work);
queue_work(isert_release_wq, &isert_conn->release_work);
}