crypto: hash - Simplify the ahash_finup implementation

The ahash_def_finup() can make use of the request save/restore functions,
thus make it so. This simplifies the code a little and unifies the code
paths.

Note that the same remark about free()ing the req->priv applies here, the
req->priv can only be free()'d after the original request was restored.

Finally, squash a bug in the invocation of completion in the ASYNC path.
In both ahash_def_finup_done{1,2}, the function areq->base.complete(X, err);
was called with X=areq->base.data . This is incorrect , as X=&areq->base
is the correct value. By analysis of the data structures, we see the areq is
of type 'struct ahash_request' , areq->base is of type 'struct crypto_async_request'
and areq->base.completion is of type crypto_completion_t, which is defined in
include/linux/crypto.h as:

  typedef void (*crypto_completion_t)(struct crypto_async_request *req, int err);

This is one lead that the X should be &areq->base . Next up, we can inspect
other code which calls the completion callback to give us kind-of statistical
idea of how this callback is used. We can try:

  $ git grep base\.complete\( drivers/crypto/

Finally, by inspecting ahash_request_set_callback() implementation defined
in include/crypto/hash.h , we observe that the .data entry of 'struct
crypto_async_request' is intended for arbitrary data, not for completion
argument.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/ahash.c b/crypto/ahash.c
index fcc6077..6e72233 100644 (file)
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -349,19 +349,16 @@ static void ahash_def_finup_finish2(struct ahash_request *req, int err)
                memcpy(priv->result, req->result,
                       crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
 
-       kzfree(priv);
+       ahash_restore_req(req);
 }
 
 static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
 {
        struct ahash_request *areq = req->data;
-       struct ahash_request_priv *priv = areq->priv;
-       crypto_completion_t complete = priv->complete;
-       void *data = priv->data;
 
        ahash_def_finup_finish2(areq, err);
 
-       complete(data, err);
+       areq->base.complete(&areq->base, err);
 }
 
 static int ahash_def_finup_finish1(struct ahash_request *req, int err)
@@ -381,38 +378,23 @@ out:
 static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
 {
        struct ahash_request *areq = req->data;
-       struct ahash_request_priv *priv = areq->priv;
-       crypto_completion_t complete = priv->complete;
-       void *data = priv->data;
 
        err = ahash_def_finup_finish1(areq, err);
 
-       complete(data, err);
+       areq->base.complete(&areq->base, err);
 }
 
 static int ahash_def_finup(struct ahash_request *req)
 {
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
-       unsigned long alignmask = crypto_ahash_alignmask(tfm);
-       unsigned int ds = crypto_ahash_digestsize(tfm);
-       struct ahash_request_priv *priv;
-
-       priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
-                      (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
-                      GFP_KERNEL : GFP_ATOMIC);
-       if (!priv)
-               return -ENOMEM;
-
-       priv->result = req->result;
-       priv->complete = req->base.complete;
-       priv->data = req->base.data;
+       int err;
 
-       req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
-       req->base.complete = ahash_def_finup_done1;
-       req->base.data = req;
-       req->priv = priv;
+       err = ahash_save_req(req, ahash_def_finup_done1);
+       if (err)
+               return err;
 
-       return ahash_def_finup_finish1(req, tfm->update(req));
+       err = tfm->update(req);
+       return ahash_def_finup_finish1(req, err);
 }
 
 static int ahash_no_export(struct ahash_request *req, void *out)