tree c799593db728356d1c2485e1d21799a2da1f5c89
parent 21dbd96f2287a49219d35a0e916cf3f2bcaab9d0
author Herbert Xu <herbert@gondor.apana.org.au> 1434885103 +0800
committer Herbert Xu <herbert@gondor.apana.org.au> 1434959358 +0800

crypto: rng - Do not free default RNG when it becomes unused

Currently we free the default RNG when its use count hits zero.
This was OK when the IV generators would latch onto the RNG at
instance creation time and keep it until the instance is torn
down.

Now that IV generators only keep the RNG reference during init
time this scheme causes the default RNG to come and go at a high
frequencey.  This is highly undesirable as we want to keep a single
RNG in use unless the admin wants it to be removed.

This patch changes the scheme so that the system RNG once allocated
is never removed unless a specifically requested.

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