tree fb8147269b5f9b412e03e3539fdb2dd3cedc0ace
parent 1a1a17cddbfb1f81222b3f18ee8530c41fbc3b82
author Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> 1275085707 -0700
committer Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> 1275085707 -0700

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>