commit 895666a9920f19bc256340aaf58d01da6e677a16
author Max Filippov <jcmvbkbc@gmail.com> Tue Mar 26 02:51:43 2013 +0400
committer Chris Zankel <chris@zankel.net> Thu May 09 01:07:11 2013 -0700
tree ff0b0fc50790d6ae5a37c5317e67523985f87bbd
parent 8f371c7521545ee120364466514a4a2fc156c64f

xtensa: disable IRQs while IRQ handler is running

IRQ handlers are expected to run with IRQs disabled.
See e.g. http://lwn.net/Articles/380931/ for a longer story.

This was overlooked in the commit
  2d1c645 xtensa: dispatch medium-priority interrupts
Revert to old behavior and simplify interrupt entry and exit code.
Interrupt handler still honours IRQ priority.

do_notify_resume/schedule must be called with interrupts enabled, enable
interrupts if we return from user exception.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>