tree ed684c45b2e32e3e8a2fdeb6ea909bed22a3ecad
parent 341476d6cf224f1dea5c439cd70181053629ce15
author Herbert Xu <herbert@gondor.apana.org.au> 1434885107 +0800
committer Herbert Xu <herbert@gondor.apana.org.au> 1434959368 +0800

crypto: eseqiv - Offer normal cipher functionality without RNG

The RNG may not be available during early boot, e.g., the relevant
modules may not be included in the initramfs.  As the RNG Is only
needed for IPsec, we should not let this prevent use of ciphers
without IV generators, e.g., for disk encryption.

This patch postpones the RNG allocation to the init function so
that one failure during early boot does not make the RNG unavailable
for all subsequent users of the same cipher.

More importantly, it lets the cipher live even if RNG allocation
fails.  Of course we no longer offer IV generation and which will
fail with an error if invoked.  But all other cipher capabilities
will function as usual.

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