Ariel Nahum b73c3adabd IB/iser: Simplify connection management ... iSER relies on refcounting to manage iser connections establishment and teardown. Following commit 39ff05dbbb ("IB/iser: Enhance disconnection logic for multi-pathing"), iser connection maintain 3 references: - iscsi_endpoint (at creation stage) - cma_id (at connection request stage) - iscsi_conn (at bind stage) We can avoid taking explicit refcounts by correctly serializing iser teardown flows (graceful and non-graceful). Our approach is to trigger a scheduled work to handle ordered teardown by gracefully waiting for 2 cleanup stages to complete: 1. Cleanup of live pending tasks indicated by iscsi_conn_stop completion 2. Flush errors processing Each completed stage will notify a waiting worker thread when it is done to allow teardwon continuation. Since iSCSI connection establishment may trigger endpoint disconnect without a successful endpoint connect, we rely on the iscsi <-> iser binding (.conn_bind) to learn about the teardown policy we should take wrt cleanup stages. Since all cleanup worker threads are scheduled (release_wq) in .ep_disconnect it is safe to assume that when module_exit is called, all cleanup workers are already scheduled. Thus proper module unload shall flush all scheduled works before allowing safe exit, to guarantee no resources got left behind. Signed-off-by: Ariel Nahum <arieln@mellanox.com> Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Reviewed-by: Roi Dayan <roid@mellanox.com> Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>		2014-05-26 08:19:48 -07:00
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ipoib	Merge branches 'cma', 'cxgb4', 'flowsteer', 'ipoib', 'misc', 'mlx4', 'mlx5', 'ocrdma', 'qib', 'srp' and 'usnic' into for-next	2014-01-22 23:24:13 -08:00
iser	IB/iser: Simplify connection management	2014-05-26 08:19:48 -07:00
isert	target: Pass in transport supported PI at session initialization	2014-04-07 01:48:54 -07:00
srp	IB/srp: Fix a race condition between failing I/O and I/O completion	2014-03-24 10:05:31 -07:00
srpt	ib_srpt: Use correct ib_sg_dma primitives	2014-04-11 15:31:20 -07:00