From c62e68963106fb4d3f45e023e8ab21f1ad2d066e Mon Sep 17 00:00:00 2001
From: Hariprasad S <hariprasad@chelsio.com>
Date: Wed, 17 Dec 2014 14:11:02 +0530
Subject: [PATCH] RDMA/cxgb4: Serialize CQ event upcalls with CQ destruction

A race exists where the application can be destroying the CQ concurrently
with a HW interrupt indicating a completion has been inserted into the CQ.
This can cause an event notification upcall to the application after the
CQ has been destroyed.

The solution is to serialize looking up the CQ in the IDR table and
referencing the CQ in c4iw_ev_handler() with removing the CQID from the
IDR table and blocking until the refcnt reaches 0 in c4iw_destroy_cq().

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
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