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Date: Wed, 23 Sep 2015 13:55:28 +0200
From: LABBE Corentin <clabbe.montjoie@...il.com>
To: herbert@...dor.apana.org.au, davem@...emloft.net
Cc: linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
LABBE Corentin <clabbe.montjoie@...il.com>
Subject: [PATCH 4/4] 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@...il.com>
---
drivers/crypto/sahara.c | 66 ++++++++++---------------------------------------
1 file changed, 13 insertions(+), 53 deletions(-)
diff --git a/drivers/crypto/sahara.c b/drivers/crypto/sahara.c
index cea2411..804c0f5 100644
--- a/drivers/crypto/sahara.c
+++ b/drivers/crypto/sahara.c
@@ -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;
-
- dev->hw_link[i]->len = sg->length;
- dev->hw_link[i]->p = sg->dma_address;
+ 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);
- 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);
--
2.4.9
--
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