linux-kernel - [PATCH] crypto: sun8i-ss: do not use sg_dma

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Message-ID: <20250427110503.14775-1-clabbe.montjoie@gmail.com>
Date: Sun, 27 Apr 2025 13:05:03 +0200
From: Corentin Labbe <clabbe.montjoie@...il.com>
To: gregkh@...uxfoundation.org,
	johan@...nel.org
Cc: linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	Corentin Labbe <clabbe.montjoie@...il.com>
Subject: [PATCH] crypto: sun8i-ss: do not use sg_dma_len before calling DMA functions

When testing sun8i-ss with multi_v7_defconfig, all CBC algorithm fail crypto
selftests.
This is strange since on sunxi_defconfig, everything was ok.
The problem was in the IV setup loop which never run because sg_dma_len
was 0.

Fixes: 359e893e8af4 ("crypto: sun8i-ss - rework handling of IV")
Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
---

If someone know why sunxi_defconfig have sg_dma_len() which always works
even with any DMA call not done.

 drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
index 4caf17310e90..ddec1b08d4f6 100644
--- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
+++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
@@ -141,7 +141,7 @@ static int sun8i_ss_setup_ivs(struct skcipher_request *areq)
 
 	/* we need to copy all IVs from source in case DMA is bi-directionnal */
 	while (sg && len) {
-		if (sg_dma_len(sg) == 0) {
+		if (sg->length == 0) {
 			sg = sg_next(sg);
 			continue;
 		}
-- 
2.49.0