Commit ae131f49 authored by Herbert Xu's avatar Herbert Xu
Browse files

crypto: api - Add crypto_tfm_get 



Add a crypto_tfm_get interface to allow tfm objects to be shared.
They can still be freed in the usual way.

This should only be done with tfm objects with no keys.  You must
also not modify the tfm flags in any way once it becomes shared.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: default avatarSimon Horman <simon.horman@corigine.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 94330fbe

crypto/api.c

+4 −0
Original line number Diff line number Diff line
@@ -408,6 +408,7 @@ struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type, 
		goto out_err;



	tfm->__crt_alg = alg;

	refcount_set(&tfm->refcnt, 1);



	err = crypto_init_ops(tfm, type, mask);

	if (err)
@@ -507,6 +508,7 @@ void *crypto_create_tfm_node(struct crypto_alg *alg, 
	tfm = (struct crypto_tfm *)(mem + tfmsize);

	tfm->__crt_alg = alg;

	tfm->node = node;

	refcount_set(&tfm->refcnt, 1);



	err = frontend->init_tfm(tfm);

	if (err)
@@ -619,6 +621,8 @@ void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm) 
	if (IS_ERR_OR_NULL(mem))

		return;



	if (!refcount_dec_and_test(&tfm->refcnt))

		return;

	alg = tfm->__crt_alg;



	if (!tfm->exit && alg->cra_exit)

crypto/internal.h

+6 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 


#include <crypto/algapi.h>

#include <linux/completion.h>

#include <linux/err.h>

#include <linux/jump_label.h>

#include <linux/list.h>

#include <linux/module.h>
@@ -186,5 +187,10 @@ static inline int crypto_is_test_larval(struct crypto_larval *larval) 
	return larval->alg.cra_driver_name[0];

}



static inline struct crypto_tfm *crypto_tfm_get(struct crypto_tfm *tfm)

{

	return refcount_inc_not_zero(&tfm->refcnt) ? tfm : ERR_PTR(-EOVERFLOW);

}



#endif	/* _CRYPTO_INTERNAL_H */

include/linux/crypto.h

+1 −0
Original line number Diff line number Diff line
@@ -419,6 +419,7 @@ int crypto_has_alg(const char *name, u32 type, u32 mask); 
 */



struct crypto_tfm {

	refcount_t refcnt;



	u32 crt_flags;