From: Rusty Russell <rusty@rustcorp.com.au>
Date: Mon, 8 Dec 2014 08:50:38 +0000 (+0800)
Subject: hwrng: fix unregister race.
X-Git-Tag: fixes-v4.0-rc1~106^2~59
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a027f30d72f2c4d27d6dd9bd053205d3102de7d1;p=pandora-kernel.git

hwrng: fix unregister race.

The previous patch added one potential problem: we can still be
reading from a hwrng when it's unregistered.  Add a wait for zero
in the hwrng_unregister path.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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