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[5/7] crypto: stm32 - check request size and scatterlist size when using DMA.

Message ID 20230706073719.1156288-6-thomas.bourgoin@foss.st.com
State Accepted
Commit a10618f397062823a84cd4abedc51f46b9d4410f
Headers show
Series Support of HASH on STM32MP13 | expand

Commit Message

Thomas Bourgoin July 6, 2023, 7:37 a.m. UTC 
From: Thomas Bourgoin <thomas.bourgoin@foss.st.com>

When we are sending the data to HASH with the DMA, we send all the data
provided in the scatterlists of the request.
But in some cases (ex : tcrypt performances tests), we should only send
req->nbytes
When iterating through the scatterlist we verify if it is the last
scatterlist or if the number of bytes sent plus the data of the current
scatterlist is superior of the total number of bytes to hash.

Signed-off-by: Thomas Bourgoin <thomas.bourgoin@foss.st.com>
---
 drivers/crypto/stm32/stm32-hash.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c
index bc2651ef5208..ee68e38b6e28 100644
--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/drivers/crypto/stm32/stm32-hash.c
@@ -659,8 +659,9 @@  static int stm32_hash_dma_send(struct stm32_hash_dev *hdev)
 	struct stm32_hash_request_ctx *rctx = ahash_request_ctx(hdev->req);
 	u32 *buffer = (void *)rctx->state.buffer;
 	struct scatterlist sg[1], *tsg;
-	int err = 0, len = 0, reg, ncp = 0;
-	unsigned int i;
+	int err = 0, reg, ncp = 0;
+	unsigned int i, len = 0, bufcnt = 0;
+	bool is_last = false;
 
 	rctx->sg = hdev->req->src;
 	rctx->total = hdev->req->nbytes;
@@ -681,7 +682,9 @@  static int stm32_hash_dma_send(struct stm32_hash_dev *hdev)
 		sg[0] = *tsg;
 		len = sg->length;
 
-		if (sg_is_last(sg)) {
+		if (sg_is_last(sg) || (bufcnt + sg[0].length) >= rctx->total) {
+			sg->length = rctx->total - bufcnt;
+			is_last = true;
 			if (hdev->dma_mode == 1) {
 				len = (ALIGN(sg->length, 16) - 16);
 
@@ -707,13 +710,15 @@  static int stm32_hash_dma_send(struct stm32_hash_dev *hdev)
 			return -ENOMEM;
 		}
 
-		err = stm32_hash_xmit_dma(hdev, sg, len,
-					  !sg_is_last(sg));
+		err = stm32_hash_xmit_dma(hdev, sg, len, !is_last);
 
+		bufcnt += sg[0].length;
 		dma_unmap_sg(hdev->dev, sg, 1, DMA_TO_DEVICE);
 
 		if (err == -ENOMEM)
 			return err;
+		if (is_last)
+			break;
 	}
 
 	if (hdev->dma_mode == 1) {