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crypto: sahara - dma_map_sg can handle chained SG 

The sahara driver use two dma_map_sg path according to SG are chained
or not.
Since dma_map_sg can handle both case, clean the code with all
references to sg chained.

Thus removing the sahara_sha_unmap_sg function.

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
LABBE Corentin 2015-09-23 13:55:28 +02:00 committed by Herbert Xu
parent 13fb8fd7a8
commit 640eec52ab
1 changed files with 12 additions and 52 deletions
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64
drivers/crypto/sahara.c
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@ -173,7 +173,6 @@ struct sahara_aes_reqctx {
* @sg_in_idx: number of hw links
* @in_sg: scatterlist for input data
* @in_sg_chain: scatterlists for chained input data
* @in_sg_chained: specifies if chained scatterlists are used or not
* @total: total number of bytes for transfer
* @last: is this the last block
* @first: is this the first block
@ -191,7 +190,6 @@ struct sahara_sha_reqctx {
unsigned int sg_in_idx;
struct scatterlist *in_sg;
struct scatterlist in_sg_chain[2];
bool in_sg_chained;
size_t total;
unsigned int last;
unsigned int first;
@ -801,38 +799,19 @@ static int sahara_sha_hw_links_create(struct sahara_dev *dev,
return -EINVAL;
}
if (rctx->in_sg_chained) {
i = start;
sg = dev->in_sg;
while (sg) {
ret = dma_map_sg(dev->device, sg, 1,
DMA_TO_DEVICE);
if (!ret)
return -EFAULT;
sg = dev->in_sg;
ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg, DMA_TO_DEVICE);
if (!ret)
return -EFAULT;
dev->hw_link[i]->len = sg->length;
dev->hw_link[i]->p = sg->dma_address;
for (i = start; i < dev->nb_in_sg + start; i++) {
dev->hw_link[i]->len = sg->length;
dev->hw_link[i]->p = sg->dma_address;
if (i == (dev->nb_in_sg + start - 1)) {
dev->hw_link[i]->next = 0;
} else {
dev->hw_link[i]->next = dev->hw_phys_link[i + 1];
sg = sg_next(sg);
i += 1;
}
dev->hw_link[i-1]->next = 0;
} else {
sg = dev->in_sg;
ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg,
DMA_TO_DEVICE);
if (!ret)
return -EFAULT;
for (i = start; i < dev->nb_in_sg + start; i++) {
dev->hw_link[i]->len = sg->length;
dev->hw_link[i]->p = sg->dma_address;
if (i == (dev->nb_in_sg + start - 1)) {
dev->hw_link[i]->next = 0;
} else {
dev->hw_link[i]->next = dev->hw_phys_link[i + 1];
sg = sg_next(sg);
}
}
}
@ -980,7 +959,6 @@ static int sahara_sha_prepare_request(struct ahash_request *req)
rctx->total = req->nbytes + rctx->buf_cnt;
rctx->in_sg = rctx->in_sg_chain;
rctx->in_sg_chained = true;
req->src = rctx->in_sg_chain;
/* only data from previous operation */
} else if (rctx->buf_cnt) {
@ -991,13 +969,11 @@ static int sahara_sha_prepare_request(struct ahash_request *req)
/* buf was copied into rembuf above */
sg_init_one(rctx->in_sg, rctx->rembuf, rctx->buf_cnt);
rctx->total = rctx->buf_cnt;
rctx->in_sg_chained = false;
/* no data from previous operation */
} else {
rctx->in_sg = req->src;
rctx->total = req->nbytes;
req->src = rctx->in_sg;
rctx->in_sg_chained = false;
}
/* on next call, we only have the remaining data in the buffer */
@ -1006,23 +982,6 @@ static int sahara_sha_prepare_request(struct ahash_request *req)
return -EINPROGRESS;
}
static void sahara_sha_unmap_sg(struct sahara_dev *dev,
struct sahara_sha_reqctx *rctx)
{
struct scatterlist *sg;
if (rctx->in_sg_chained) {
sg = dev->in_sg;
while (sg) {
dma_unmap_sg(dev->device, sg, 1, DMA_TO_DEVICE);
sg = sg_next(sg);
}
} else {
dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
DMA_TO_DEVICE);
}
}
static int sahara_sha_process(struct ahash_request *req)
{
struct sahara_dev *dev = dev_ptr;
@ -1062,7 +1021,8 @@ static int sahara_sha_process(struct ahash_request *req)
}
if (rctx->sg_in_idx)
sahara_sha_unmap_sg(dev, rctx);
dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
DMA_TO_DEVICE);
memcpy(rctx->context, dev->context_base, rctx->context_size);