crypto: engine - remove {prepare,unprepare}_crypt_hardware callbacks

The {prepare,unprepare}_crypt_hardware callbacks were added back in 2016
by commit 735d37b ("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>

Author: ovpanait

Documentation/crypto/crypto_engine.rst

@@ -36,12 +36,6 @@ engine using ``crypto_engine_stop()`` and destroy the engine with
 Before transferring any request, you have to fill the context enginectx by
 providing functions for the following:
 
-* ``prepare_crypt_hardware``: Called once before any prepare functions are
-  called.
-
-* ``unprepare_crypt_hardware``: Called once after all unprepare functions have
-  been called.
-
 * ``prepare_cipher_request``/``prepare_hash_request``: Called before each
   corresponding request is performed. If some processing or other preparatory
   work is required, do it here.

crypto/crypto_engine.c

@@ -74,7 +74,6 @@ static void crypto_pump_requests(struct crypto_engine *engine,
 	struct crypto_engine_alg *alg;
 	struct crypto_engine_op *op;
 	unsigned long flags;
-	bool was_busy = false;
 	int ret;
 
 	spin_lock_irqsave(&engine->queue_lock, flags);
@@ -83,12 +82,6 @@ static void crypto_pump_requests(struct crypto_engine *engine,
 	if (!engine->retry_support && engine->cur_req)
 		goto out;
 
-	/* If another context is idling then defer */
-	if (engine->idling) {
-		kthread_queue_work(engine->kworker, &engine->pump_requests);
-		goto out;
-	}
-
 	/* Check if the engine queue is idle */
 	if (!crypto_queue_len(&engine->queue) || !engine->running) {
 		if (!engine->busy)
@@ -102,15 +95,6 @@ static void crypto_pump_requests(struct crypto_engine *engine,
 		}
 
 		engine->busy = false;
-		engine->idling = true;
-		spin_unlock_irqrestore(&engine->queue_lock, flags);
-
-		if (engine->unprepare_crypt_hardware &&
-		    engine->unprepare_crypt_hardware(engine))
-			dev_err(engine->dev, "failed to unprepare crypt hardware\n");
-
-		spin_lock_irqsave(&engine->queue_lock, flags);
-		engine->idling = false;
 		goto out;
 	}
 
@@ -129,22 +113,11 @@ static void crypto_pump_requests(struct crypto_engine *engine,
 	if (!engine->retry_support)
 		engine->cur_req = async_req;
 
-	if (engine->busy)
-		was_busy = true;
-	else
+	if (!engine->busy)
 		engine->busy = true;
 
 	spin_unlock_irqrestore(&engine->queue_lock, flags);
 
-	/* Until here we get the request need to be encrypted successfully */
-	if (!was_busy && engine->prepare_crypt_hardware) {
-		ret = engine->prepare_crypt_hardware(engine);
-		if (ret) {
-			dev_err(engine->dev, "failed to prepare crypt hardware\n");
-			goto req_err_1;
-		}
-	}
-
 	alg = container_of(async_req->tfm->__crt_alg,
 			   struct crypto_engine_alg, base);
 	op = &alg->op;
@@ -474,7 +447,6 @@ struct crypto_engine *crypto_engine_alloc_init_and_set(struct device *dev,
 	engine->rt = rt;
 	engine->running = false;
 	engine->busy = false;
-	engine->idling = false;
 	engine->retry_support = retry_support;
 	engine->priv_data = dev;
 

include/crypto/internal/engine.h

@@ -21,7 +21,6 @@ struct device;
 /*
  * struct crypto_engine - crypto hardware engine
  * @name: the engine name
- * @idling: the engine is entering idle state
  * @busy: request pump is busy
  * @running: the engine is on working
  * @retry_support: indication that the hardware allows re-execution
@@ -31,20 +30,13 @@ struct device;
  * @list: link with the global crypto engine list
  * @queue_lock: spinlock to synchronise access to request queue
  * @queue: the crypto queue of the engine
- * @prepare_crypt_hardware: a request will soon arrive from the queue
- * so the subsystem requests the driver to prepare the hardware
- * by issuing this call
- * @unprepare_crypt_hardware: there are currently no more requests on the
- * queue so the subsystem notifies the driver that it may relax the
- * hardware by issuing this call
  * @kworker: kthread worker struct for request pump
  * @pump_requests: work struct for scheduling work to the request pump
  * @priv_data: the engine private data
  * @cur_req: the current request which is on processing
  */
 struct crypto_engine {
 	char			name[ENGINE_NAME_LEN];
-	bool			idling;
 	bool			busy;
 	bool			running;
 
@@ -56,9 +48,6 @@ struct crypto_engine {
 	struct crypto_queue	queue;
 	struct device		*dev;
 
-	int (*prepare_crypt_hardware)(struct crypto_engine *engine);
-	int (*unprepare_crypt_hardware)(struct crypto_engine *engine);
-
 	struct kthread_worker           *kworker;
 	struct kthread_work             pump_requests;