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crypto: marvell/cesa - use presence of scatterlist to determine data load

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Use the presence of the scatterlist to determine whether we should load
any new user data to the engine.  The following shall always be true at
this point:

	iter.base.op_len == 0 === iter.src.sg

In doing so, we can:

1. eliminate the test for iter.base.op_len inside the loop, which
   makes the loop operation more obvious and understandable.

2. move the operation generation for the cache-only case.

This prepares the code for the next step in its transformation, and also
uncovers a bug that will be fixed in the next patch.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Russell King 2015-10-18 17:24:21 +01:00 committed by Herbert Xu
parent 0971d09a85
commit d9bba4c3eb
1 changed files with 21 additions and 18 deletions
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39
drivers/crypto/marvell/hash.c
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@ -627,7 +627,27 @@ static int mv_cesa_ahash_dma_req_init(struct ahash_request *req)
if (ret)
goto err_free_tdma;
if (creq->cache_ptr && !iter.base.op_len) {
if (iter.src.sg) {
/*
* Add all the new data, inserting an operation block and
* launch command between each full SRAM block-worth of
* data.
*/
do {
ret = mv_cesa_dma_add_op_transfers(&chain, &iter.base,
&iter.src, flags);
if (ret)
goto err_free_tdma;
op = mv_cesa_dma_add_frag(&chain, &creq->op_tmpl,
iter.base.op_len, flags);
if (IS_ERR(op)) {
ret = PTR_ERR(op);
goto err_free_tdma;
}
} while (mv_cesa_ahash_req_iter_next_op(&iter));
} else if (creq->cache_ptr) {
/* Account for the data that was in the cache. */
op = mv_cesa_dma_add_frag(&chain, &creq->op_tmpl,
creq->cache_ptr, flags);
if (IS_ERR(op)) {
@ -636,23 +656,6 @@ static int mv_cesa_ahash_dma_req_init(struct ahash_request *req)
}
}
do {
if (!iter.base.op_len)
break;
ret = mv_cesa_dma_add_op_transfers(&chain, &iter.base,
&iter.src, flags);
if (ret)
goto err_free_tdma;
op = mv_cesa_dma_add_frag(&chain, &creq->op_tmpl,
iter.base.op_len, flags);
if (IS_ERR(op)) {
ret = PTR_ERR(op);
goto err_free_tdma;
}
} while (mv_cesa_ahash_req_iter_next_op(&iter));
op = mv_cesa_ahash_dma_last_req(&chain, &iter, creq, op, flags);
if (IS_ERR(op)) {
ret = PTR_ERR(op);