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: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
goto out_err;
tfm->__crt_alg = alg;
+ refcount_set(&tfm->refcnt, 1);
err = crypto_init_ops(tfm, type, mask);
if (err)
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)
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)
#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>
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 */
*/
struct crypto_tfm {
+ refcount_t refcnt;
u32 crt_flags;