crypto: api - Add crypto_type_has_alg helper

This patch adds the helper crypto_type_has_alg which is meant
to replace crypto_has_alg for new-style crypto types.  Rather
than hard-coding type/mask information they're now retrieved
from the crypto_type object.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/algapi.c b/crypto/algapi.c
index 7be76aa..731255a 100644 (file)
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -987,6 +987,21 @@ unsigned int crypto_alg_extsize(struct crypto_alg *alg)
 }
 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
 
+int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
+                       u32 type, u32 mask)
+{
+       int ret = 0;
+       struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
+
+       if (!IS_ERR(alg)) {
+               crypto_mod_put(alg);
+               ret = 1;
+       }
+
+       return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_type_has_alg);
+
 static int __init crypto_algapi_init(void)
 {
        crypto_init_proc();

diff --git a/crypto/internal.h b/crypto/internal.h
index 00e42a3..7eefcdb 100644 (file)
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -104,6 +104,9 @@ int crypto_probing_notify(unsigned long val, void *v);
 
 unsigned int crypto_alg_extsize(struct crypto_alg *alg);
 
+int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
+                       u32 type, u32 mask);
+
 static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg)
 {
        atomic_inc(&alg->cra_refcnt);