The {prepare,unprepare}_crypt_hardware callbacks were added back in 2016 by commit 735d37b5424b ("crypto: engine - Introduce the block request crypto engine framework"), but they were never implemented by any driver. Remove them as they are unused. Since the 'engine->idling' and 'was_busy' flags are no longer needed, remove them as well. Signed-off-by: Ovidiu Panait <ovidiu.panait.oss@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>