From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Date: Fri, 28 May 2010 22:28:27 +0000 (-0700)
Subject: xen/evtchn: don't do unbind_from_irqhandler under spinlock
X-Git-Tag: v2.6.37-rc4~60^2^3~1^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3f5e554f669098c84c82ce75e7577f7e0f3fccde;p=pandora-kernel.git

xen/evtchn: don't do unbind_from_irqhandler under spinlock

unbind_from_irqhandler can end up doing /proc operations, which can't
happen under a spinlock.  So before removing the IRQ handler,
disable the irq under the port_user lock (masking the underlying event
channel and making sure the irq handler isn't running concurrently and
won't start running), then remove the handler without the lock.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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