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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.

Change-Id: Ibd214034fd4a9509484a7e5409a1524b468fb09a
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>
This commit is contained in:
Marek Vasut 2014-03-14 02:37:06 +01:00 committed by Luca Stefani
parent e5c241d26c
commit b1efc151e9
1 changed files with 9 additions and 27 deletions
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36
crypto/ahash.c
View File

@ -350,19 +350,16 @@ 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)
@ -382,38 +379,23 @@ 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;
int err;
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;
err = ahash_save_req(req, ahash_def_finup_done1);
if (err)
return err;
priv->result = req->result;
priv->complete = req->base.complete;
priv->data = req->base.data;
req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
req->base.complete = ahash_def_finup_done1;
req->base.data = req;
req->priv = priv;
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)