From 09238443c61e58f7fac8a3892b14b1bee40b4316 Mon Sep 17 00:00:00 2001
From: Feng Tang <feng.tang@intel.com>
Date: Wed, 9 Oct 2013 10:39:16 +0800
Subject: [PATCH] serial: mrst_max3110: Check the irq number before
 enable/disabe irq in PM hooks

We should check the validity of the irq number before calling
disable_irq() and enable_irq() in the suspend/resume function,
as "max->irq == 0" means the irq is not enabled for max3110
device, otherwise it will hurt device whose irq number is really 0.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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