From: Kumar Sanghvi <kumaras@chelsio.com>
Date: Mon, 24 Oct 2011 15:50:22 +0000 (+0530)
Subject: RDMA/cxgb3: Serialize calls to CQ's comp_handler
X-Git-Tag: v3.2-rc1~104^2^3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f7cc25d018f1e9af6767ee7774bbe83452e9fdf4;p=pandora-kernel.git

RDMA/cxgb3: Serialize calls to CQ's comp_handler

iw_cxgb3 has a potential problem where a CQ's comp_handler can get
called simultaneously from different places in iw_cxgb3 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.

Such problem was reported by Parav Pandit <Parav.Pandit@Emulex.Com>
for iw_cxgb4 driver.  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.

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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