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crypto: inside-secure - comment the caching function

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Cosmetic patch adding a few comments to the ahash caching function to
understand easily what calculations are made in the functions; and how
the function is working.

Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Antoine Ténart 2017-12-14 15:26:46 +01:00 committed by Herbert Xu
parent 60310eae7d
commit cc75f5ce82
1 changed files with 10 additions and 0 deletions
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10
drivers/crypto/inside-secure/safexcel_hash.c
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@ -484,13 +484,23 @@ static int safexcel_ahash_exit_inv(struct crypto_tfm *tfm)
return 0;
}
/* safexcel_ahash_cache: cache data until at least one request can be sent to
* the engine, aka. when there is at least 1 block size in the pipe.
*/
static int safexcel_ahash_cache(struct ahash_request *areq)
{
struct safexcel_ahash_req *req = ahash_request_ctx(areq);
struct crypto_ahash *ahash = crypto_ahash_reqtfm(areq);
int queued, cache_len;
/* cache_len: everyting accepted by the driver but not sent yet,
* tot sz handled by update() - last req sz - tot sz handled by send()
*/
cache_len = req->len - areq->nbytes - req->processed;
/* queued: everything accepted by the driver which will be handled by
* the next send() calls.
* tot sz handled by update() - tot sz handled by send()
*/
queued = req->len - req->processed;
/*