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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iscsi_iser.c	IB/iser: Simplify connection management	2014-05-26 08:19:48 -07:00
iscsi_iser.h	IB/iser: Simplify connection management	2014-05-26 08:19:48 -07:00
iser_initiator.c	IB/iser: Update Mellanox copyright note	2014-04-01 11:09:46 -07:00
iser_memory.c	IB/iser: Update Mellanox copyright note	2014-04-01 11:09:46 -07:00
iser_verbs.c	IB/iser: Simplify connection management	2014-05-26 08:19:48 -07:00
Kconfig	Update broken web addresses in the kernel.	2010-10-18 11:03:14 +02:00
Makefile	IB/iser: iSER Kconfig and Makefile	2006-06-22 07:51:14 -07:00