From: Eli Cohen <eli@mellanox.com>
Date: Tue, 6 Mar 2012 13:50:51 +0000 (+0200)
Subject: IB/mlx4: Fix possible missed completion event
X-Git-Tag: v3.4-rc1~169^2~1^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3616f9cead935d4e4c35915600d5e4d1384219cd;p=pandora-kernel.git

IB/mlx4: Fix possible missed completion event

If an erroneous CQE is polled in the first iteration (i.e. npolled ==
0), we don't update the consumer index and hence the hardware could
get a wrong notion of how many CQEs software polled.  Fix this by
unconditionally updating the doorbell record.  We could change the
check to be something like

	if (npolled || err != -EAGAIN)
		...

but it does not seem worth the effort since a posted write to memory
should not cost too much.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
---

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