linux-kernel - [PATCH v2 03/14] crypto: omap-aes: Populate number of SG elements

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Date:	Sat, 17 Aug 2013 21:42:24 -0500
From:	Joel Fernandes <joelf@...com>
To:	Herbert Xu <herbert@...dor.hengli.com.au>,
	"David S. Miller" <davem@...emloft.net>,
	Mark Greer <mgreer@...malcreek.com>,
	Tony Lindgren <tony@...mide.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Rajendra Nayak <rnayak@...com>,
	Lokesh Vutla <lokeshvutla@...com>
CC:	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
	Joel Fernandes <joelf@...com>
Subject: [PATCH v2 03/14] crypto: omap-aes: Populate number of SG elements

Crypto layer only passes nbytes but number of SG elements is needed for mapping
or unmapping SGs at one time using dma_map* API and also needed to pass in for
dmaengine prep function.

We call function added to scatterwalk for this purpose in omap_aes_handle_queue
to populate the values which are used later.

Signed-off-by: Joel Fernandes <joelf@...com>
---
 drivers/crypto/omap-aes.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index 26b802b..e369e6e 100644
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -164,6 +164,8 @@ struct omap_aes_dev {
 	void			*buf_out;
 	int			dma_out;
 	struct dma_chan		*dma_lch_out;
+	int			in_sg_len;
+	int			out_sg_len;
 	dma_addr_t		dma_addr_out;
 
 	const struct omap_aes_pdata	*pdata;
@@ -731,6 +733,10 @@ static int omap_aes_handle_queue(struct omap_aes_dev *dd,
 	dd->out_offset = 0;
 	dd->out_sg = req->dst;
 
+	dd->in_sg_len = scatterwalk_bytes_sglen(dd->in_sg, dd->total);
+	dd->out_sg_len = scatterwalk_bytes_sglen(dd->out_sg, dd->total);
+	BUG_ON(dd->in_sg_len < 0 || dd->out_sg_len < 0);
+
 	rctx = ablkcipher_request_ctx(req);
 	ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
 	rctx->mode &= FLAGS_MODE_MASK;
-- 
1.7.9.5

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