Target/iscsi,iser: Avoid accepting transport connections during stop stage
When the target is in stop stage, iSER transport initiates RDMA disconnects. The iSER initiator may wish to establish a new connection over the still existing network portal. In this case iSER transport should not accept and resume new RDMA connections. In order to learn that, iscsi_np is added with enabled flag so the iSER transport can check when deciding weather to accept and resume a new connection request. The iscsi_np is enabled after successful transport setup, and disabled before iscsi_np login threads are cleaned up. Signed-off-by: NSagi Grimberg <sagig@mellanox.com> Cc: stable@vger.kernel.org # 3.10+ Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>
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