[GitHub/mt8127/android_kernel_alcatel_ttab.git] / crypto / cryptd.c

/*
 * Software async crypto daemon.
 *
 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <crypto/algapi.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#define CRYPTD_MAX_QLEN 100

struct cryptd_state {
	spinlock_t lock;
	struct mutex mutex;
	struct crypto_queue queue;
	struct task_struct *task;
};

struct cryptd_instance_ctx {
	struct crypto_spawn spawn;
	struct cryptd_state *state;
};

struct cryptd_blkcipher_ctx {
	struct crypto_blkcipher *child;
};

struct cryptd_blkcipher_request_ctx {
	crypto_completion_t complete;
};


static inline struct cryptd_state *cryptd_get_state(struct crypto_tfm *tfm)
{
	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
	struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
	return ictx->state;
}

static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
				   const u8 *key, unsigned int keylen)
{
	struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
	struct crypto_blkcipher *child = ctx->child;
	int err;

	crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
					  CRYPTO_TFM_REQ_MASK);
	err = crypto_blkcipher_setkey(child, key, keylen);
	crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
					    CRYPTO_TFM_RES_MASK);
	return err;
}

static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
				   struct crypto_blkcipher *child,
				   int err,
				   int (*crypt)(struct blkcipher_desc *desc,
						struct scatterlist *dst,
						struct scatterlist *src,
						unsigned int len))
{
	struct cryptd_blkcipher_request_ctx *rctx;
	struct blkcipher_desc desc;

	rctx = ablkcipher_request_ctx(req);

	if (unlikely(err == -EINPROGRESS)) {
		rctx->complete(&req->base, err);
		return;
	}

	desc.tfm = child;
	desc.info = req->info;
	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;

	err = crypt(&desc, req->dst, req->src, req->nbytes);

	req->base.complete = rctx->complete;

	local_bh_disable();
	req->base.complete(&req->base, err);
	local_bh_enable();
}

static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
{
	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
	struct crypto_blkcipher *child = ctx->child;

	cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
			       crypto_blkcipher_crt(child)->encrypt);
}

static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
{
	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
	struct crypto_blkcipher *child = ctx->child;

	cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
			       crypto_blkcipher_crt(child)->decrypt);
}

static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
				    crypto_completion_t complete)
{
	struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
	struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
	struct cryptd_state *state =
		cryptd_get_state(crypto_ablkcipher_tfm(tfm));
	int err;

	rctx->complete = req->base.complete;
	req->base.complete = complete;

	spin_lock_bh(&state->lock);
	err = ablkcipher_enqueue_request(&state->queue, req);
	spin_unlock_bh(&state->lock);

	wake_up_process(state->task);
	return err;
}

static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
{
	return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
}

static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
{
	return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
}

static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
{
	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
	struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
	struct crypto_spawn *spawn = &ictx->spawn;
	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
	struct crypto_blkcipher *cipher;

	cipher = crypto_spawn_blkcipher(spawn);
	if (IS_ERR(cipher))
		return PTR_ERR(cipher);

	ctx->child = cipher;
	tfm->crt_ablkcipher.reqsize =
		sizeof(struct cryptd_blkcipher_request_ctx);
	return 0;
}

static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
{
	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
	struct cryptd_state *state = cryptd_get_state(tfm);
	int active;

	mutex_lock(&state->mutex);
	active = ablkcipher_tfm_in_queue(&state->queue,
					 __crypto_ablkcipher_cast(tfm));
	mutex_unlock(&state->mutex);

	BUG_ON(active);

	crypto_free_blkcipher(ctx->child);
}

static struct crypto_instance *cryptd_alloc_instance(struct crypto_alg *alg,
						     struct cryptd_state *state)
{
	struct crypto_instance *inst;
	struct cryptd_instance_ctx *ctx;
	int err;

	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
	if (!inst) {
		inst = ERR_PTR(-ENOMEM);
		goto out;
	}

	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
		goto out_free_inst;

	ctx = crypto_instance_ctx(inst);
	err = crypto_init_spawn(&ctx->spawn, alg, inst,
				CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
	if (err)
		goto out_free_inst;

	ctx->state = state;

	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);

	inst->alg.cra_priority = alg->cra_priority + 50;
	inst->alg.cra_blocksize = alg->cra_blocksize;
	inst->alg.cra_alignmask = alg->cra_alignmask;

out:
	return inst;

out_free_inst:
	kfree(inst);
	inst = ERR_PTR(err);
	goto out;
}

static struct crypto_instance *cryptd_alloc_blkcipher(
	struct rtattr **tb, struct cryptd_state *state)
{
	struct crypto_instance *inst;
	struct crypto_alg *alg;

	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
				  CRYPTO_ALG_TYPE_MASK);
	if (IS_ERR(alg))
		return ERR_CAST(alg);

	inst = cryptd_alloc_instance(alg, state);
	if (IS_ERR(inst))
		goto out_put_alg;

	inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
	inst->alg.cra_type = &crypto_ablkcipher_type;

	inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
	inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
	inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;

	inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;

	inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);

	inst->alg.cra_init = cryptd_blkcipher_init_tfm;
	inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;

	inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
	inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
	inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;

out_put_alg:
	crypto_mod_put(alg);
	return inst;
}

static struct cryptd_state state;

static struct crypto_instance *cryptd_alloc(struct rtattr **tb)
{
	struct crypto_attr_type *algt;

	algt = crypto_get_attr_type(tb);
	if (IS_ERR(algt))
		return ERR_CAST(algt);

	switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
	case CRYPTO_ALG_TYPE_BLKCIPHER:
		return cryptd_alloc_blkcipher(tb, &state);
	}

	return ERR_PTR(-EINVAL);
}

static void cryptd_free(struct crypto_instance *inst)
{
	struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);

	crypto_drop_spawn(&ctx->spawn);
	kfree(inst);
}

static struct crypto_template cryptd_tmpl = {
	.name = "cryptd",
	.alloc = cryptd_alloc,
	.free = cryptd_free,
	.module = THIS_MODULE,
};

static inline int cryptd_create_thread(struct cryptd_state *state,
				       int (*fn)(void *data), const char *name)
{
	spin_lock_init(&state->lock);
	mutex_init(&state->mutex);
	crypto_init_queue(&state->queue, CRYPTD_MAX_QLEN);

	state->task = kthread_run(fn, state, name);
	if (IS_ERR(state->task))
		return PTR_ERR(state->task);

	return 0;
}

static inline void cryptd_stop_thread(struct cryptd_state *state)
{
	BUG_ON(state->queue.qlen);
	kthread_stop(state->task);
}

static int cryptd_thread(void *data)
{
	struct cryptd_state *state = data;
	int stop;

	current->flags |= PF_NOFREEZE;

	do {
		struct crypto_async_request *req, *backlog;

		mutex_lock(&state->mutex);
		__set_current_state(TASK_INTERRUPTIBLE);

		spin_lock_bh(&state->lock);
		backlog = crypto_get_backlog(&state->queue);
		req = crypto_dequeue_request(&state->queue);
		spin_unlock_bh(&state->lock);

		stop = kthread_should_stop();

		if (stop || req) {
			__set_current_state(TASK_RUNNING);
			if (req) {
				if (backlog)
					backlog->complete(backlog,
							  -EINPROGRESS);
				req->complete(req, 0);
			}
		}

		mutex_unlock(&state->mutex);

		schedule();
	} while (!stop);

	return 0;
}

static int __init cryptd_init(void)
{
	int err;

	err = cryptd_create_thread(&state, cryptd_thread, "cryptd");
	if (err)
		return err;

	err = crypto_register_template(&cryptd_tmpl);
	if (err)
		kthread_stop(state.task);

	return err;
}

static void __exit cryptd_exit(void)
{
	cryptd_stop_thread(&state);
	crypto_unregister_template(&cryptd_tmpl);
}

module_init(cryptd_init);
module_exit(cryptd_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Software async crypto daemon");
Commit	Line	Data
124b53d0 HX	1	/*
	2	* Software async crypto daemon.
	3	*
	4	* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the Free
	8	* Software Foundation; either version 2 of the License, or (at your option)
	9	* any later version.
	10	*
	11	*/
	12
	13	#include <crypto/algapi.h>
	14	#include <linux/err.h>
	15	#include <linux/init.h>
	16	#include <linux/kernel.h>
	17	#include <linux/kthread.h>
	18	#include <linux/list.h>
	19	#include <linux/module.h>
	20	#include <linux/mutex.h>
	21	#include <linux/scatterlist.h>
	22	#include <linux/sched.h>
	23	#include <linux/slab.h>
	24	#include <linux/spinlock.h>
	25
	26	#define CRYPTD_MAX_QLEN 100
	27
	28	struct cryptd_state {
	29	spinlock_t lock;
	30	struct mutex mutex;
	31	struct crypto_queue queue;
	32	struct task_struct *task;
	33	};
	34
	35	struct cryptd_instance_ctx {
	36	struct crypto_spawn spawn;
	37	struct cryptd_state *state;
	38	};
	39
	40	struct cryptd_blkcipher_ctx {
	41	struct crypto_blkcipher *child;
	42	};
	43
	44	struct cryptd_blkcipher_request_ctx {
	45	crypto_completion_t complete;
	46	};
	47
	48
	49	static inline struct cryptd_state cryptd_get_state(struct crypto_tfm tfm)
	50	{
	51	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
	52	struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
	53	return ictx->state;
	54	}
	55
	56	static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
	57	const u8 *key, unsigned int keylen)
	58	{
	59	struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
	60	struct crypto_blkcipher *child = ctx->child;
	61	int err;
	62
	63	crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	64	crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
65	CRYPTO_TFM_REQ_MASK);
66	err = crypto_blkcipher_setkey(child, key, keylen);
67	crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
68	CRYPTO_TFM_RES_MASK);
69	return err;
70	}
71
72	static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
73	struct crypto_blkcipher *child,
74	int err,
75	int (crypt)(struct blkcipher_desc desc,
76	struct scatterlist *dst,
77	struct scatterlist *src,
78	unsigned int len))
79	{
80	struct cryptd_blkcipher_request_ctx *rctx;
81	struct blkcipher_desc desc;
82
83	rctx = ablkcipher_request_ctx(req);
84
85	if (unlikely(err == -EINPROGRESS)) {
86	rctx->complete(&req->base, err);
87	return;
88	}
89
90	desc.tfm = child;
91	desc.info = req->info;
92	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
93
94	err = crypt(&desc, req->dst, req->src, req->nbytes);
95
96	req->base.complete = rctx->complete;
97
98	local_bh_disable();
99	req->base.complete(&req->base, err);
100	local_bh_enable();
101	}
102
103	static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
104	{
105	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
106	struct crypto_blkcipher *child = ctx->child;
107
108	cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
109	crypto_blkcipher_crt(child)->encrypt);
110	}
111
112	static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
113	{
114	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
115	struct crypto_blkcipher *child = ctx->child;
116
117	cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
118	crypto_blkcipher_crt(child)->decrypt);
119	}
120
121	static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
122	crypto_completion_t complete)
123	{
124	struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
125	struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
126	struct cryptd_state *state =
127	cryptd_get_state(crypto_ablkcipher_tfm(tfm));
128	int err;
129
130	rctx->complete = req->base.complete;
131	req->base.complete = complete;
132
133	spin_lock_bh(&state->lock);
2de98e75	134	err = ablkcipher_enqueue_request(&state->queue, req);
124b53d0 HX	135	spin_unlock_bh(&state->lock);
	136
	137	wake_up_process(state->task);
	138	return err;
	139	}
	140
	141	static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
	142	{
	143	return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
	144	}
	145
	146	static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
	147	{
	148	return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
	149	}
	150
	151	static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
	152	{
	153	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
	154	struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
	155	struct crypto_spawn *spawn = &ictx->spawn;
	156	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
	157	struct crypto_blkcipher *cipher;
	158
	159	cipher = crypto_spawn_blkcipher(spawn);
	160	if (IS_ERR(cipher))
	161	return PTR_ERR(cipher);
	162
	163	ctx->child = cipher;
	164	tfm->crt_ablkcipher.reqsize =
	165	sizeof(struct cryptd_blkcipher_request_ctx);
	166	return 0;
	167	}
	168
	169	static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
	170	{
	171	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
	172	struct cryptd_state *state = cryptd_get_state(tfm);
	173	int active;
	174
	175	mutex_lock(&state->mutex);
2de98e75 HX	176	active = ablkcipher_tfm_in_queue(&state->queue,
2de98e75 HX	177	__crypto_ablkcipher_cast(tfm));
124b53d0 HX	178	mutex_unlock(&state->mutex);
	179
	180	BUG_ON(active);
	181
	182	crypto_free_blkcipher(ctx->child);
	183	}
	184
	185	static struct crypto_instance cryptd_alloc_instance(struct crypto_alg alg,
	186	struct cryptd_state *state)
	187	{
	188	struct crypto_instance *inst;
	189	struct cryptd_instance_ctx *ctx;
	190	int err;
	191
	192	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
b1145ce3 JL	193	if (!inst) {
b1145ce3 JL	194	inst = ERR_PTR(-ENOMEM);
124b53d0	195	goto out;
b1145ce3	196	}
124b53d0 HX	197
	198	err = -ENAMETOOLONG;
	199	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
	200	"cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
	201	goto out_free_inst;
	202
	203	ctx = crypto_instance_ctx(inst);
	204	err = crypto_init_spawn(&ctx->spawn, alg, inst,
	205	CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_ASYNC);
	206	if (err)
	207	goto out_free_inst;
	208
	209	ctx->state = state;
	210
	211	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
	212
	213	inst->alg.cra_priority = alg->cra_priority + 50;
	214	inst->alg.cra_blocksize = alg->cra_blocksize;
	215	inst->alg.cra_alignmask = alg->cra_alignmask;
	216
	217	out:
	218	return inst;
	219
	220	out_free_inst:
	221	kfree(inst);
	222	inst = ERR_PTR(err);
	223	goto out;
	224	}
	225
	226	static struct crypto_instance *cryptd_alloc_blkcipher(
	227	struct rtattr *tb, struct cryptd_state state)
	228	{
	229	struct crypto_instance *inst;
	230	struct crypto_alg *alg;
	231
	232	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
332f8840	233	CRYPTO_ALG_TYPE_MASK);
124b53d0	234	if (IS_ERR(alg))
e231c2ee	235	return ERR_CAST(alg);
124b53d0 HX	236
	237	inst = cryptd_alloc_instance(alg, state);
	238	if (IS_ERR(inst))
	239	goto out_put_alg;
	240
332f8840	241	inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER \| CRYPTO_ALG_ASYNC;
124b53d0 HX	242	inst->alg.cra_type = &crypto_ablkcipher_type;
	243
	244	inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
	245	inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
	246	inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
	247
927eead5 HX	248	inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;
927eead5 HX	249
124b53d0 HX	250	inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
	251
	252	inst->alg.cra_init = cryptd_blkcipher_init_tfm;
	253	inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
	254
	255	inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
	256	inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
	257	inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
	258
124b53d0 HX	259	out_put_alg:
	260	crypto_mod_put(alg);
	261	return inst;
	262	}
	263
	264	static struct cryptd_state state;
	265
	266	static struct crypto_instance cryptd_alloc(struct rtattr *tb)
	267	{
	268	struct crypto_attr_type *algt;
	269
	270	algt = crypto_get_attr_type(tb);
	271	if (IS_ERR(algt))
e231c2ee	272	return ERR_CAST(algt);
124b53d0 HX	273
	274	switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
	275	case CRYPTO_ALG_TYPE_BLKCIPHER:
	276	return cryptd_alloc_blkcipher(tb, &state);
	277	}
	278
	279	return ERR_PTR(-EINVAL);
	280	}
	281
	282	static void cryptd_free(struct crypto_instance *inst)
	283	{
	284	struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
	285
	286	crypto_drop_spawn(&ctx->spawn);
	287	kfree(inst);
	288	}
	289
	290	static struct crypto_template cryptd_tmpl = {
	291	.name = "cryptd",
	292	.alloc = cryptd_alloc,
	293	.free = cryptd_free,
	294	.module = THIS_MODULE,
	295	};
	296
	297	static inline int cryptd_create_thread(struct cryptd_state *state,
	298	int (fn)(void data), const char *name)
	299	{
	300	spin_lock_init(&state->lock);
	301	mutex_init(&state->mutex);
	302	crypto_init_queue(&state->queue, CRYPTD_MAX_QLEN);
	303
189fe317	304	state->task = kthread_run(fn, state, name);
124b53d0 HX	305	if (IS_ERR(state->task))
	306	return PTR_ERR(state->task);
	307
	308	return 0;
	309	}
	310
	311	static inline void cryptd_stop_thread(struct cryptd_state *state)
	312	{
	313	BUG_ON(state->queue.qlen);
	314	kthread_stop(state->task);
	315	}
	316
	317	static int cryptd_thread(void *data)
	318	{
	319	struct cryptd_state *state = data;
	320	int stop;
	321
189fe317 RW	322	current->flags \|= PF_NOFREEZE;
189fe317 RW	323
124b53d0 HX	324	do {
	325	struct crypto_async_request req, backlog;
	326
	327	mutex_lock(&state->mutex);
	328	__set_current_state(TASK_INTERRUPTIBLE);
	329
	330	spin_lock_bh(&state->lock);
	331	backlog = crypto_get_backlog(&state->queue);
	332	req = crypto_dequeue_request(&state->queue);
	333	spin_unlock_bh(&state->lock);
	334
	335	stop = kthread_should_stop();
	336
	337	if (stop \|\| req) {
	338	__set_current_state(TASK_RUNNING);
	339	if (req) {
	340	if (backlog)
	341	backlog->complete(backlog,
	342	-EINPROGRESS);
	343	req->complete(req, 0);
	344	}
	345	}
	346
	347	mutex_unlock(&state->mutex);
	348
	349	schedule();
	350	} while (!stop);
	351
	352	return 0;
	353	}
	354
	355	static int __init cryptd_init(void)
	356	{
	357	int err;
	358
	359	err = cryptd_create_thread(&state, cryptd_thread, "cryptd");
	360	if (err)
	361	return err;
	362
	363	err = crypto_register_template(&cryptd_tmpl);
	364	if (err)
	365	kthread_stop(state.task);
	366
	367	return err;
	368	}
	369
	370	static void __exit cryptd_exit(void)
	371	{
	372	cryptd_stop_thread(&state);
	373	crypto_unregister_template(&cryptd_tmpl);
	374	}
	375
	376	module_init(cryptd_init);
	377	module_exit(cryptd_exit);
	378
	379	MODULE_LICENSE("GPL");
	380	MODULE_DESCRIPTION("Software async crypto daemon");