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crypto: mv_cesa - Fix situation where the dest sglist is organized differently than the source sglist

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Bugfix for situations where the destination scatterlist has a different
buffer structure than the source scatterlist (e.g. source has one 2K
buffer and dest has 2 1K buffers)

Signed-off-by: Uri Simchoni <uri@jdland.co.il>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Uri Simchoni 2010-04-08 19:26:34 +03:00 committed by Herbert Xu
parent 6bc6fcd609
commit f565e67ec1
1 changed files with 9 additions and 5 deletions
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14
drivers/crypto/mv_cesa.c
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@ -242,6 +242,8 @@ static void dequeue_complete_req(void)
struct ablkcipher_request *req = cpg->cur_req;
void *buf;
int ret;
int need_copy_len = cpg->p.crypt_len;
int sram_offset = 0;
cpg->p.total_req_bytes += cpg->p.crypt_len;
do {
@ -257,14 +259,16 @@ static void dequeue_complete_req(void)
buf = cpg->p.dst_sg_it.addr;
buf += cpg->p.dst_start;
dst_copy = min(cpg->p.crypt_len, cpg->p.sg_dst_left);
memcpy(buf, cpg->sram + SRAM_DATA_OUT_START, dst_copy);
dst_copy = min(need_copy_len, cpg->p.sg_dst_left);
memcpy(buf,
cpg->sram + SRAM_DATA_OUT_START + sram_offset,
dst_copy);
sram_offset += dst_copy;
cpg->p.sg_dst_left -= dst_copy;
cpg->p.crypt_len -= dst_copy;
need_copy_len -= dst_copy;
cpg->p.dst_start += dst_copy;
} while (cpg->p.crypt_len > 0);
} while (need_copy_len > 0);
BUG_ON(cpg->eng_st != ENGINE_W_DEQUEUE);
if (cpg->p.total_req_bytes < req->nbytes) {