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Subject[PATCH v2] crypto: s5p: update iv after AES-CBC op end
Date
Fix bug "s5p-sss crypto driver doesn't set next AES-CBC IV". While at this,
fix also AES-CTR mode. Tested on Odroid U3 with Eric Biggers branch
"iv-out-testing".

Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com>
Reported-by: Eric Biggers <ebiggers@kernel.org>
---
Changes since v1:
- reworded Subject and commit message
- changed code according to comments by Krzysztof Kozlowski
- added Reported-by line
---
drivers/crypto/s5p-sss.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/crypto/s5p-sss.c b/drivers/crypto/s5p-sss.c
index 0064be0e3941..30b4f1015d8f 100644
--- a/drivers/crypto/s5p-sss.c
+++ b/drivers/crypto/s5p-sss.c
@@ -463,6 +463,9 @@ static void s5p_sg_copy_buf(void *buf, struct scatterlist *sg,

static void s5p_sg_done(struct s5p_aes_dev *dev)
{
+ struct ablkcipher_request *req = dev->req;
+ struct s5p_aes_reqctx *reqctx = ablkcipher_request_ctx(req);
+
if (dev->sg_dst_cpy) {
dev_dbg(dev->dev,
"Copying %d bytes of output data back to original place\n",
@@ -472,6 +475,11 @@ static void s5p_sg_done(struct s5p_aes_dev *dev)
}
s5p_free_sg_cpy(dev, &dev->sg_src_cpy);
s5p_free_sg_cpy(dev, &dev->sg_dst_cpy);
+ if (reqctx->mode & FLAGS_AES_CBC)
+ memcpy_fromio(req->info, dev->aes_ioaddr + SSS_REG_AES_IV_DATA(0), AES_BLOCK_SIZE);
+
+ else if (reqctx->mode & FLAGS_AES_CTR)
+ memcpy_fromio(req->info, dev->aes_ioaddr + SSS_REG_AES_CNT_DATA(0), AES_BLOCK_SIZE);
}

/* Calls the completion. Cannot be called with dev->lock hold. */
--
2.20.1
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