From: Sathya Perla <sathyap@serverengines.com>
Date: Thu, 18 Jun 2009 00:02:59 +0000 (+0000)
Subject: be2net: Add MCC queue mechanism for BE cmds
X-Git-Tag: v2.6.31-rc1~63^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5fb379ee67a7ec55ff65b467b472f3d69b60ba16;p=pandora-kernel.git

be2net: Add MCC queue mechanism for BE cmds

Currenlty all cmds use the blocking MCC mbox to post cmds. An mbox cmd is protected
via a spin_lock(cmd_lock) and not spin_lock_bh() as it is undesirable
to disable BHs while a blocking mbox cmd is in progress (and take long to finish.)
This can lockup a cmd in progress in process context. Instead cmds that may be
called in BH context must use the MCC queue to post cmds. The cmd completions
are rcvd in a separate completion queue and the events are placed in the tx-event
queue.

Signed-off-by: Sathya Perla <sathyap@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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