From 34cb27528398738bea94852b99ef8fb05944ec41 Mon Sep 17 00:00:00 2001
From: Vitalii Demianets <vitas@nppfactor.kiev.ua>
Date: Thu, 20 Jun 2013 16:36:00 +0300
Subject: [PATCH] UIO: Fix concurrency issue

In a SMP case there was a race condition issue between
uio_pdrv_genirq_irqcontrol() running on one CPU and irq handler on
another CPU. Fix it by spin_locking shared resources access inside irq
handler.  Also:
  - Change disable_irq to disable_irq_nosync to avoid deadlock, because
    disable_irq waits for the completion of the irq handler;
  - Change atomic bit-manipulation routines to their non-atomic
    counterparts as we already are guarding the code by spinlock.

Signed-off-by: Vitalii Demianets <vitas@nppfactor.kiev.ua>
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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