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crypto: s5p-sss - Constify pointed data (arguments and local variables)

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Improve the code (safety and readability) by indicating that data passed
through pointer is not modified.  This adds const keyword in many places,
most notably:
 - the driver data (pointer to struct samsung_aes_variant),
 - scatterlist addresses written as value to device registers,
 - key and IV arrays.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Krzysztof Kozlowski 2018-03-01 21:50:13 +01:00 committed by Herbert Xu
parent 0e477c59ba
commit 6584eacb7c
1 changed files with 17 additions and 14 deletions
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31
drivers/crypto/s5p-sss.c
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@ -404,29 +404,31 @@ static const struct of_device_id s5p_sss_dt_match[] = {
};
MODULE_DEVICE_TABLE(of, s5p_sss_dt_match);
static inline struct samsung_aes_variant *find_s5p_sss_version
(struct platform_device *pdev)
static inline const struct samsung_aes_variant *find_s5p_sss_version
(const struct platform_device *pdev)
{
if (IS_ENABLED(CONFIG_OF) && (pdev->dev.of_node)) {
const struct of_device_id *match;
match = of_match_node(s5p_sss_dt_match,
pdev->dev.of_node);
return (struct samsung_aes_variant *)match->data;
return (const struct samsung_aes_variant *)match->data;
}
return (struct samsung_aes_variant *)
return (const struct samsung_aes_variant *)
platform_get_device_id(pdev)->driver_data;
}
static struct s5p_aes_dev *s5p_dev;
static void s5p_set_dma_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
static void s5p_set_dma_indata(struct s5p_aes_dev *dev,
const struct scatterlist *sg)
{
SSS_WRITE(dev, FCBRDMAS, sg_dma_address(sg));
SSS_WRITE(dev, FCBRDMAL, sg_dma_len(sg));
}
static void s5p_set_dma_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
static void s5p_set_dma_outdata(struct s5p_aes_dev *dev,
const struct scatterlist *sg)
{
SSS_WRITE(dev, FCBTDMAS, sg_dma_address(sg));
SSS_WRITE(dev, FCBTDMAL, sg_dma_len(sg));
@ -619,7 +621,7 @@ static inline void s5p_hash_write(struct s5p_aes_dev *dd,
* @sg: scatterlist ready to DMA transmit
*/
static void s5p_set_dma_hashdata(struct s5p_aes_dev *dev,
struct scatterlist *sg)
const struct scatterlist *sg)
{
dev->hash_sg_cnt--;
SSS_WRITE(dev, FCHRDMAS, sg_dma_address(sg));
@ -792,9 +794,9 @@ static void s5p_hash_read_msg(struct ahash_request *req)
* @ctx: request context
*/
static void s5p_hash_write_ctx_iv(struct s5p_aes_dev *dd,
struct s5p_hash_reqctx *ctx)
const struct s5p_hash_reqctx *ctx)
{
u32 *hash = (u32 *)ctx->digest;
const u32 *hash = (const u32 *)ctx->digest;
unsigned int i;
for (i = 0; i < ctx->nregs; i++)
@ -818,7 +820,7 @@ static void s5p_hash_write_iv(struct ahash_request *req)
*/
static void s5p_hash_copy_result(struct ahash_request *req)
{
struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
const struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
if (!req->result)
return;
@ -1290,7 +1292,7 @@ static int s5p_hash_prepare_request(struct ahash_request *req, bool update)
*/
static void s5p_hash_update_dma_stop(struct s5p_aes_dev *dd)
{
struct s5p_hash_reqctx *ctx = ahash_request_ctx(dd->hash_req);
const struct s5p_hash_reqctx *ctx = ahash_request_ctx(dd->hash_req);
dma_unmap_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE);
clear_bit(HASH_FLAGS_DMA_ACTIVE, &dd->hash_flags);
@ -1717,7 +1719,7 @@ static void s5p_hash_cra_exit(struct crypto_tfm *tfm)
*/
static int s5p_hash_export(struct ahash_request *req, void *out)
{
struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
const struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
memcpy(out, ctx, sizeof(*ctx) + ctx->bufcnt);
@ -1831,7 +1833,8 @@ static struct ahash_alg algs_sha1_md5_sha256[] = {
};
static void s5p_set_aes(struct s5p_aes_dev *dev,
uint8_t *key, uint8_t *iv, unsigned int keylen)
const uint8_t *key, const uint8_t *iv,
unsigned int keylen)
{
void __iomem *keystart;
@ -2150,7 +2153,7 @@ static int s5p_aes_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
int i, j, err = -ENODEV;
struct samsung_aes_variant *variant;
const struct samsung_aes_variant *variant;
struct s5p_aes_dev *pdata;
struct resource *res;
unsigned int hash_i;