crypto: api - Use dedicated workqueue for crypto subsystem

Use dedicated workqueue for crypto subsystem

A dedicated workqueue named kcrypto_wq is created to be used by crypto
subsystem. The system shared keventd_wq is not suitable for
encryption/decryption, because of potential starvation problem.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Huang Ying 2009-02-19 14:33:40 +08:00 committed by Herbert Xu
parent 6fe4a28d88
commit 25c38d3fb9
4 changed files with 50 additions and 0 deletions

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@ -106,6 +106,9 @@ config CRYPTO_NULL
help help
These are 'Null' algorithms, used by IPsec, which do nothing. These are 'Null' algorithms, used by IPsec, which do nothing.
config CRYPTO_WORKQUEUE
tristate
config CRYPTO_CRYPTD config CRYPTO_CRYPTD
tristate "Software async crypto daemon" tristate "Software async crypto daemon"
select CRYPTO_BLKCIPHER select CRYPTO_BLKCIPHER

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@ -5,6 +5,8 @@
obj-$(CONFIG_CRYPTO) += crypto.o obj-$(CONFIG_CRYPTO) += crypto.o
crypto-objs := api.o cipher.o digest.o compress.o crypto-objs := api.o cipher.o digest.o compress.o
obj-$(CONFIG_CRYPTO_WORKQUEUE) += crypto_wq.o
obj-$(CONFIG_CRYPTO_FIPS) += fips.o obj-$(CONFIG_CRYPTO_FIPS) += fips.o
crypto_algapi-$(CONFIG_PROC_FS) += proc.o crypto_algapi-$(CONFIG_PROC_FS) += proc.o

38
crypto/crypto_wq.c Normal file
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@ -0,0 +1,38 @@
/*
* Workqueue for crypto subsystem
*
* Copyright (c) 2009 Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
*
* 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 <linux/workqueue.h>
#include <crypto/algapi.h>
#include <crypto/crypto_wq.h>
struct workqueue_struct *kcrypto_wq;
EXPORT_SYMBOL_GPL(kcrypto_wq);
static int __init crypto_wq_init(void)
{
kcrypto_wq = create_workqueue("crypto");
if (unlikely(!kcrypto_wq))
return -ENOMEM;
return 0;
}
static void __exit crypto_wq_exit(void)
{
destroy_workqueue(kcrypto_wq);
}
module_init(crypto_wq_init);
module_exit(crypto_wq_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Workqueue for crypto subsystem");

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@ -0,0 +1,7 @@
#ifndef CRYPTO_WQ_H
#define CRYPTO_WQ_H
#include <linux/workqueue.h>
extern struct workqueue_struct *kcrypto_wq;
#endif