From: Ralph Campbell <ralph.campbell@qlogic.com>
Date: Fri, 19 Oct 2007 22:04:10 +0000 (-0700)
Subject: IB/ipath: Fix a race where s_last is updated without lock held
X-Git-Tag: v2.6.24-rc2~71^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fffbfeaa680e2b87a591e141f2aa7e9e91184956;p=pandora-kernel.git

IB/ipath: Fix a race where s_last is updated without lock held

There is a small window where a send work queue entry could be
overwritten by ib_post_send() because s_last is updated before the
entry is read.

This patch closes the window by acquiring the lock and updating
the last send work queue entry index after reading the wr_id.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
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