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crypto: api - Move type exit function into crypto_tfm 

The type exit function needs to undo any allocations done by the type
init function.  However, the type init function may differ depending
on the upper-level type of the transform (e.g., a crypto_blkcipher
instantiated as a crypto_ablkcipher).

So we need to move the exit function out of the lower-level
structure and into crypto_tfm itself.

As it stands this is a no-op since nobody uses exit functions at
all.  However, all cases where a lower-level type is instantiated
as a different upper-level type (such as blkcipher as ablkcipher)
will be converted such that they allocate the underlying transform
and use that instead of casting (e.g., crypto_ablkcipher casted
into crypto_blkcipher).  That will need to use a different exit
function depending on the upper-level type.

This patch also allows the type init/exit functions to call (or not)
cra_init/cra_exit instead of always calling them from the top level.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2008-09-13 18:19:03 -07:00
parent 2566578a6f
commit 4a7794860b
3 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
crypto/api.c
View File

@ -300,8 +300,8 @@ static void crypto_exit_ops(struct crypto_tfm *tfm)
const struct crypto_type *type = tfm->__crt_alg->cra_type;
if (type) {
if (type->exit)
type->exit(tfm);
if (tfm->exit)
tfm->exit(tfm);
return;
}
@ -379,17 +379,16 @@ struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
if (err)
goto out_free_tfm;
if (alg->cra_init && (err = alg->cra_init(tfm))) {
if (err == -EAGAIN)
crypto_shoot_alg(alg);
if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
goto cra_init_failed;
}
goto out;
cra_init_failed:
crypto_exit_ops(tfm);
out_free_tfm:
if (err == -EAGAIN)
crypto_shoot_alg(alg);
kfree(tfm);
out_err:
tfm = ERR_PTR(err);
@ -469,7 +468,7 @@ void crypto_free_tfm(struct crypto_tfm *tfm)
alg = tfm->__crt_alg;
size = sizeof(*tfm) + alg->cra_ctxsize;
if (alg->cra_exit)
if (!tfm->exit && alg->cra_exit)
alg->cra_exit(tfm);
crypto_exit_ops(tfm);
crypto_mod_put(alg);

1
include/crypto/algapi.h
View File

@ -23,7 +23,6 @@ struct seq_file;
struct crypto_type {
unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
void (*exit)(struct crypto_tfm *tfm);
void (*show)(struct seq_file *m, struct crypto_alg *alg);
};

2
include/linux/crypto.h
View File

@ -480,6 +480,8 @@ struct crypto_tfm {
struct compress_tfm compress;
struct rng_tfm rng;
} crt_u;
void (*exit)(struct crypto_tfm *tfm);
struct crypto_alg *__crt_alg;