From: Kumar Sanghvi <kumaras@chelsio.com>
Date: Mon, 24 Oct 2011 15:50:21 +0000 (+0530)
Subject: RDMA/cxgb4: Serialize calls to CQ's comp_handler
X-Git-Tag: v3.2-rc1~104^2^4~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=581bbe2cd0694a935e0c3ccd7f011e10094f1df6;p=pandora-kernel.git

RDMA/cxgb4: Serialize calls to CQ's comp_handler

Commit 01e7da6ba53c ("RDMA/cxgb4: Make sure flush CQ entries are
collected on connection close") introduced a potential problem where a
CQ's comp_handler can get called simultaneously from different places
in the iw_cxgb4 driver.  This does not comply with
Documentation/infiniband/core_locking.txt, which states that at a
given point of time, there should be only one callback per CQ should
be active.

This problem was reported by Parav Pandit <Parav.Pandit@Emulex.Com>.
Based on discussion between Parav Pandit and Steve Wise, this patch
fixes the above problem by serializing the calls to a CQ's
comp_handler using a spin_lock.

Reported-by: Parav Pandit <Parav.Pandit@Emulex.Com>
Signed-off-by: Kumar Sanghvi <kumaras@chelsio.com>
Acked-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
---

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