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Date: Wed, 19 Oct 2016 13:54:30 +0200
From: Petr Mladek <pmladek@...e.com>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>,
linux-crypto@...r.kernel.org, Tejun Heo <tj@...nel.org>,
linux-kernel@...r.kernel.org, Petr Mladek <pmladek@...e.com>
Subject: [PATCH] crypto: engine - Handle the kthread worker using the new API
Use the new API to create and destroy the crypto engine kthread
worker. The API hides some implementation details.
In particular, kthread_create_worker() allocates and initializes
struct kthread_worker. It runs the kthread the right way
and stores task_struct into the worker structure.
kthread_destroy_worker() flushes all pending works, stops
the kthread and frees the structure.
This patch does not change the existing behavior except for
dynamically allocating struct kthread_worker and storing
only the pointer of this structure.
It is compile tested only because I did not find an easy
way how to run the code. Well, it should be pretty safe
given the nature of the change.
Signed-off-by: Petr Mladek <pmladek@...e.com>
---
crypto/crypto_engine.c | 26 +++++++++++---------------
include/crypto/engine.h | 6 ++----
2 files changed, 13 insertions(+), 19 deletions(-)
diff --git a/crypto/crypto_engine.c b/crypto/crypto_engine.c
index 6989ba0046df..f1bf3418d968 100644
--- a/crypto/crypto_engine.c
+++ b/crypto/crypto_engine.c
@@ -47,7 +47,7 @@ static void crypto_pump_requests(struct crypto_engine *engine,
/* If another context is idling then defer */
if (engine->idling) {
- kthread_queue_work(&engine->kworker, &engine->pump_requests);
+ kthread_queue_work(engine->kworker, &engine->pump_requests);
goto out;
}
@@ -58,7 +58,7 @@ static void crypto_pump_requests(struct crypto_engine *engine,
/* Only do teardown in the thread */
if (!in_kthread) {
- kthread_queue_work(&engine->kworker,
+ kthread_queue_work(engine->kworker,
&engine->pump_requests);
goto out;
}
@@ -189,7 +189,7 @@ int crypto_transfer_cipher_request(struct crypto_engine *engine,
ret = ablkcipher_enqueue_request(&engine->queue, req);
if (!engine->busy && need_pump)
- kthread_queue_work(&engine->kworker, &engine->pump_requests);
+ kthread_queue_work(engine->kworker, &engine->pump_requests);
spin_unlock_irqrestore(&engine->queue_lock, flags);
return ret;
@@ -231,7 +231,7 @@ int crypto_transfer_hash_request(struct crypto_engine *engine,
ret = ahash_enqueue_request(&engine->queue, req);
if (!engine->busy && need_pump)
- kthread_queue_work(&engine->kworker, &engine->pump_requests);
+ kthread_queue_work(engine->kworker, &engine->pump_requests);
spin_unlock_irqrestore(&engine->queue_lock, flags);
return ret;
@@ -284,7 +284,7 @@ void crypto_finalize_cipher_request(struct crypto_engine *engine,
req->base.complete(&req->base, err);
- kthread_queue_work(&engine->kworker, &engine->pump_requests);
+ kthread_queue_work(engine->kworker, &engine->pump_requests);
}
EXPORT_SYMBOL_GPL(crypto_finalize_cipher_request);
@@ -321,7 +321,7 @@ void crypto_finalize_hash_request(struct crypto_engine *engine,
req->base.complete(&req->base, err);
- kthread_queue_work(&engine->kworker, &engine->pump_requests);
+ kthread_queue_work(engine->kworker, &engine->pump_requests);
}
EXPORT_SYMBOL_GPL(crypto_finalize_hash_request);
@@ -345,7 +345,7 @@ int crypto_engine_start(struct crypto_engine *engine)
engine->running = true;
spin_unlock_irqrestore(&engine->queue_lock, flags);
- kthread_queue_work(&engine->kworker, &engine->pump_requests);
+ kthread_queue_work(engine->kworker, &engine->pump_requests);
return 0;
}
@@ -422,11 +422,8 @@ struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt)
crypto_init_queue(&engine->queue, CRYPTO_ENGINE_MAX_QLEN);
spin_lock_init(&engine->queue_lock);
- kthread_init_worker(&engine->kworker);
- engine->kworker_task = kthread_run(kthread_worker_fn,
- &engine->kworker, "%s",
- engine->name);
- if (IS_ERR(engine->kworker_task)) {
+ engine->kworker = kthread_create_worker(0, "%s", engine->name);
+ if (IS_ERR(engine->kworker)) {
dev_err(dev, "failed to create crypto request pump task\n");
return NULL;
}
@@ -434,7 +431,7 @@ struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt)
if (engine->rt) {
dev_info(dev, "will run requests pump with realtime priority\n");
- sched_setscheduler(engine->kworker_task, SCHED_FIFO, ¶m);
+ sched_setscheduler(engine->kworker->task, SCHED_FIFO, ¶m);
}
return engine;
@@ -455,8 +452,7 @@ int crypto_engine_exit(struct crypto_engine *engine)
if (ret)
return ret;
- kthread_flush_worker(&engine->kworker);
- kthread_stop(engine->kworker_task);
+ kthread_destroy_worker(engine->kworker);
return 0;
}
diff --git a/include/crypto/engine.h b/include/crypto/engine.h
index 04eb5c77addd..1bf600fc99f7 100644
--- a/include/crypto/engine.h
+++ b/include/crypto/engine.h
@@ -43,8 +43,7 @@
* @prepare_hash_request: do some prepare if need before handle the current request
* @unprepare_hash_request: undo any work done by prepare_hash_request()
* @hash_one_request: do hash for current request
- * @kworker: thread struct for request pump
- * @kworker_task: pointer to task for request pump kworker thread
+ * @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
@@ -78,8 +77,7 @@ struct crypto_engine {
int (*hash_one_request)(struct crypto_engine *engine,
struct ahash_request *req);
- struct kthread_worker kworker;
- struct task_struct *kworker_task;
+ struct kthread_worker *kworker;
struct kthread_work pump_requests;
void *priv_data;
--
1.8.5.6
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