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@xxxxxxxxx>
---
crypto/Kconfig | 3 +++
crypto/Makefile | 2 ++
crypto/crypto_wq.c | 38 ++++++++++++++++++++++++++++++++++++++
include/crypto/crypto_wq.h | 7 +++++++
4 files changed, 50 insertions(+)
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -106,6 +106,9 @@ config CRYPTO_NULL
help
These are 'Null' algorithms, used by IPsec, which do nothing.
+config CRYPTO_WORKQUEUE
+ tristate
+
config CRYPTO_CRYPTD
tristate "Software async crypto daemon"
select CRYPTO_BLKCIPHER
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -5,6 +5,8 @@
obj-$(CONFIG_CRYPTO) += crypto.o
crypto-objs := api.o cipher.o digest.o compress.o
+obj-$(CONFIG_CRYPTO_WORKQUEUE) += crypto_wq.o
+
obj-$(CONFIG_CRYPTO_FIPS) += fips.o
crypto_algapi-$(CONFIG_PROC_FS) += proc.o
--- /dev/null
+++ b/crypto/crypto_wq.c
@@ -0,0 +1,38 @@
+/*
+ * Workqueue for crypto subsystem
+ *
+ * Copyright (c) 2009 Intel Corp.
+ * Author: Huang Ying <ying.huang@xxxxxxxxx>
+ *
+ * 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");
--- /dev/null
+++ b/include/crypto/crypto_wq.h
@@ -0,0 +1,7 @@
+#ifndef CRYPTO_WQ_H
+#define CRYPTO_WQ_H
+
+#include <linux/workqueue.h>
+
+extern struct workqueue_struct *kcrypto_wq;
+#endif
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