[CRYPTO] api: Added cra_init/cra_exit

This patch adds the hooks cra_init/cra_exit which are called during a tfm's
construction and destruction respectively.  This will be used by the instances
to allocate child tfm's.

For now this lets us get rid of the coa_init/coa_exit functions which are
used for exactly that purpose (unlike the dia_init function which is called
for each transaction).

In fact the coa_exit path is currently buggy as it may get called twice
when an error is encountered during initialisation.

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

1 files changed, 8 insertions, 3 deletions

diff --git a/crypto/api.c b/crypto/api.c
index 80bba637fba7..8145310d7985 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -188,13 +188,16 @@ struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags)
         if (crypto_init_flags(tfm, flags))
                 goto out_free_tfm;
                 
-        if (crypto_init_ops(tfm)) {
-                crypto_exit_ops(tfm);
+        if (crypto_init_ops(tfm))
                 goto out_free_tfm;
-        }
+
+        if (alg->cra_init && alg->cra_init(tfm))
+                goto cra_init_failed;
 
         goto out;
 
+cra_init_failed:
+        crypto_exit_ops(tfm);
 out_free_tfm:
         kfree(tfm);
         tfm = NULL;
@@ -215,6 +218,8 @@ void crypto_free_tfm(struct crypto_tfm *tfm)
         alg = tfm->__crt_alg;
         size = sizeof(*tfm) + alg->cra_ctxsize;
 
+        if (alg->cra_exit)
+                alg->cra_exit(tfm);
         crypto_exit_ops(tfm);
         crypto_alg_put(alg);
         memset(tfm, 0, size);