iw_cm: free cm_id resources on the last deref

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Remove the complicated logic to free the iw_cm_id inside iw_cm
event handlers vs when an application thread destroys the cm_id.
Also remove the block in iw_destroy_cm_id() to block the application
until all references are removed.  This block can cause a deadlock when
disconnecting or destroying cm_ids inside an rdma_cm event handler.
Simply allowing the last deref of the iw_cm_id to free the memory
is cleaner and avoids this potential deadlock. Also a flag is added,
IW_CM_DROP_EVENTS, that is set when the cm_id is marked for destruction.
If any events are pending on this iw_cm_id, then as they are processed
they will be dropped vs posted upstream if IW_CM_DROP_EVENTS is set.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

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Steve Wise 2016-07-29 11:00:54 -07:00 • committed by Doug Ledford

parent ad61a4c7a9

commit 59c68ac31e

2 changed files with 18 additions and 38 deletions

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54

drivers/infiniband/core/iwcm.c

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2

drivers/infiniband/core/iwcm.h

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