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[CRYPTO] api: Add crypto_alg reference counting

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Up until now we've relied on module reference counting to ensure that the
crypto_alg structures don't disappear from under us.  This was good enough
as long as each crypto_alg came from exactly one module.

However, with parameterised crypto algorithms a crypto_alg object may need
two or more modules to operate.  This means that we need to count the
references to the crypto_alg object directly.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
2006-08-06 20:28:44 +10:00
parent 72fa491912
commit 6521f30273
3 changed files with 32 additions and 6 deletions
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3
include/linux/crypto.h
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@@ -17,6 +17,7 @@
#ifndef _LINUX_CRYPTO_H
#define _LINUX_CRYPTO_H
#include <asm/atomic.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
@@ -148,6 +149,7 @@ struct crypto_alg {
unsigned int cra_alignmask;
int cra_priority;
atomic_t cra_refcnt;
char cra_name[CRYPTO_MAX_ALG_NAME];
char cra_driver_name[CRYPTO_MAX_ALG_NAME];
@@ -160,6 +162,7 @@ struct crypto_alg {
int (*cra_init)(struct crypto_tfm *tfm);
void (*cra_exit)(struct crypto_tfm *tfm);
void (*cra_destroy)(struct crypto_alg *alg);
struct module *cra_module;
};