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crypto: sahara - do not resize req->src when doing hash operations 

[ Upstream commit a3c6f4f4d2 ]

When testing sahara sha256 speed performance with tcrypt (mode=404) on
imx53-qsrb board, multiple "Invalid numbers of src SG." errors are
reported. This was traced to sahara_walk_and_recalc() resizing req->src
and causing the subsequent dma_map_sg() call to fail.

Now that the previous commit fixed sahara_sha_hw_links_create() to take
into account the actual request size, rather than relying on sg->length
values, the resize operation is no longer necessary.

Therefore, remove sahara_walk_and_recalc() and simplify associated logic.

Fixes: 5a2bb93f59 ("crypto: sahara - add support for SHA1/256")
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ovidiu Panait 2023-12-24 10:21:36 +02:00 committed by Greg Kroah-Hartman
parent 12c7bc0d9f
commit b1eb1f817f
1 changed files with 2 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/crypto/sahara.c
View File

@ -886,24 +886,6 @@ static int sahara_sha_hw_context_descriptor_create(struct sahara_dev *dev,
return 0;
}
static int sahara_walk_and_recalc(struct scatterlist *sg, unsigned int nbytes)
{
if (!sg || !sg->length)
return nbytes;
while (nbytes && sg) {
if (nbytes <= sg->length) {
sg->length = nbytes;
sg_mark_end(sg);
break;
}
nbytes -= sg->length;
sg = sg_next(sg);
}
return nbytes;
}
static int sahara_sha_prepare_request(struct ahash_request *req)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
@ -940,36 +922,20 @@ static int sahara_sha_prepare_request(struct ahash_request *req)
hash_later, 0);
}
/* nbytes should now be multiple of blocksize */
req->nbytes = req->nbytes - hash_later;
sahara_walk_and_recalc(req->src, req->nbytes);
rctx->total = len - hash_later;
/* have data from previous operation and current */
if (rctx->buf_cnt && req->nbytes) {
sg_init_table(rctx->in_sg_chain, 2);
sg_set_buf(rctx->in_sg_chain, rctx->rembuf, rctx->buf_cnt);
sg_chain(rctx->in_sg_chain, 2, req->src);
rctx->total = req->nbytes + rctx->buf_cnt;
rctx->in_sg = rctx->in_sg_chain;
req->src = rctx->in_sg_chain;
/* only data from previous operation */
} else if (rctx->buf_cnt) {
if (req->src)
rctx->in_sg = req->src;
else
rctx->in_sg = rctx->in_sg_chain;
/* buf was copied into rembuf above */
rctx->in_sg = rctx->in_sg_chain;
sg_init_one(rctx->in_sg, rctx->rembuf, rctx->buf_cnt);
rctx->total = rctx->buf_cnt;
/* no data from previous operation */
} else {
rctx->in_sg = req->src;
rctx->total = req->nbytes;
req->src = rctx->in_sg;
}
/* on next call, we only have the remaining data in the buffer */