linux-kernel - [PATCH -next 4/4] crypto: starfive: Use fallback for unaligned dma access

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Date: Mon, 29 Apr 2024 14:06:40 +0800
From: Jia Jie Ho <jiajie.ho@...rfivetech.com>
To: Herbert Xu <herbert@...dor.apana.org.au>,
	"David S . Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH -next 4/4] crypto: starfive: Use fallback for unaligned dma access

Dma address mapping fails on unaligned scatterlist offset. Use sw
fallback for these cases.

Signed-off-by: Jia Jie Ho <jiajie.ho@...rfivetech.com>
---
 drivers/crypto/starfive/jh7110-aes.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/crypto/starfive/jh7110-aes.c b/drivers/crypto/starfive/jh7110-aes.c
index 9d6e2f936f03..86a1a1fa9f8f 100644
--- a/drivers/crypto/starfive/jh7110-aes.c
+++ b/drivers/crypto/starfive/jh7110-aes.c
@@ -314,7 +314,7 @@ static int starfive_aes_read_authtag(struct starfive_cryp_ctx *ctx)
 					 cryp->total_in, cryp->authsize, 1);
 	} else {
 		if (crypto_memneq(cryp->tag_in, cryp->tag_out, cryp->authsize))
-			return dev_err_probe(cryp->dev, -EBADMSG, "Failed tag verification\n");
+			return -EBADMSG;
 	}
 
 	return 0;
@@ -753,14 +753,16 @@ static bool starfive_aes_check_unaligned(struct starfive_cryp_dev *cryp,
 	int i;
 
 	for_each_sg(src, tsg, sg_nents(src), i)
-		if (!IS_ALIGNED(tsg->length, AES_BLOCK_SIZE) &&
-		    !sg_is_last(tsg))
+		if (!IS_ALIGNED(tsg->offset, sizeof(u32)) ||
+		    (!IS_ALIGNED(tsg->length, AES_BLOCK_SIZE) &&
+		     !sg_is_last(tsg)))
 			return true;
 
 	if (src != dst)
 		for_each_sg(dst, tsg, sg_nents(dst), i)
-			if (!IS_ALIGNED(tsg->length, AES_BLOCK_SIZE) &&
-			    !sg_is_last(tsg))
+			if (!IS_ALIGNED(tsg->offset, sizeof(u32)) ||
+			    (!IS_ALIGNED(tsg->length, AES_BLOCK_SIZE) &&
+			     !sg_is_last(tsg)))
 				return true;
 
 	return false;
-- 
2.40.1