From 15b66cd54291186011f733cc750263f320b8a0a4 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Tue, 23 Dec 2014 16:40:18 +1100
Subject: [PATCH] hwrng: core - Fix current_rng init/cleanup race yet again

The kref solution is still buggy because we were only focusing
on the register/unregister race.  The same race affects the
setting of current_rng through sysfs.

This patch fixes it by using kref_get_unless_zero.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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