From 2962aecef2878e2192ac9676700469678507c24d Mon Sep 17 00:00:00 2001
From: Hans-Frieder Vogt <hfvogt@gmx.net>
Date: Sun, 6 Oct 2013 21:13:35 +0200
Subject: [PATCH] w1 - fix fops in w1_bus_notify

Introduce a check to make sure that fops are only called if they have
been defined by the slave module.

Without this check modules like w1_smem cause a NULL pointer dereference
bug.

Signed-off by: Hans-Frieder Vogt <hfvogt@gmx.net>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Cc: stable <stable@vger.kernel.org> # 3.11+

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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