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authorHerbert Xu <herbert@gondor.apana.org.au>2009-07-07 14:07:37 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2009-07-07 18:55:28 +0800
commit70ec7bb91ad0d6cce84c8e17f8cbb608dda7b18c (patch)
treef8423c8e2a51b42c78ea63913a9e3654877555ca /crypto/algapi.c
parentf2ac72e8268d9559c3114d5a22679f91f80a2238 (diff)
downloadlinux-70ec7bb91ad0d6cce84c8e17f8cbb608dda7b18c.tar.gz
crypto: api - Add crypto_alloc_instance2
This patch adds a new argument to crypto_alloc_instance which sets aside some space before the instance for use by algorithms such as shash that place type-specific data before crypto_alg. For compatibility the function has been renamed so that existing users aren't affected. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/algapi.c')
-rw-r--r--crypto/algapi.c37
1 files changed, 31 insertions, 6 deletions
diff --git a/crypto/algapi.c b/crypto/algapi.c
index 56c62e2858d..429f1a003b0 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -627,17 +627,20 @@ int crypto_attr_u32(struct rtattr *rta, u32 *num)
}
EXPORT_SYMBOL_GPL(crypto_attr_u32);
-struct crypto_instance *crypto_alloc_instance(const char *name,
- struct crypto_alg *alg)
+void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
+ unsigned int head)
{
struct crypto_instance *inst;
- struct crypto_spawn *spawn;
+ char *p;
int err;
- inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
- if (!inst)
+ p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
+ GFP_KERNEL);
+ if (!p)
return ERR_PTR(-ENOMEM);
+ inst = (void *)(p + head);
+
err = -ENAMETOOLONG;
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
@@ -647,6 +650,25 @@ struct crypto_instance *crypto_alloc_instance(const char *name,
name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
+ return p;
+
+err_free_inst:
+ kfree(p);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
+
+struct crypto_instance *crypto_alloc_instance(const char *name,
+ struct crypto_alg *alg)
+{
+ struct crypto_instance *inst;
+ struct crypto_spawn *spawn;
+ int err;
+
+ inst = crypto_alloc_instance2(name, alg, 0);
+ if (IS_ERR(inst))
+ goto out;
+
spawn = crypto_instance_ctx(inst);
err = crypto_init_spawn(spawn, alg, inst,
CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
@@ -658,7 +680,10 @@ struct crypto_instance *crypto_alloc_instance(const char *name,
err_free_inst:
kfree(inst);
- return ERR_PTR(err);
+ inst = ERR_PTR(err);
+
+out:
+ return inst;
}
EXPORT_SYMBOL_GPL(crypto_alloc_instance);