Subject: [PATCH v2 1/3] crypto: powerpc - don't unnecessarily use atomic scatterwalk

From: Eric Biggers <[email-masked]>
Date: Mon, 14 Oct 2019 19:45:15 -0700

From: Eric Biggers <[email-masked]>

The PowerPC SPE implementations of AES modes only disable preemption
during the actual encryption/decryption, not during the scatterwalk
functions.  It's therefore unnecessary to request an atomic scatterwalk.
So don't do so.

Signed-off-by: Eric Biggers <[email-masked]>
---
 arch/powerpc/crypto/aes-spe-glue.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/arch/powerpc/crypto/aes-spe-glue.c b/arch/powerpc/crypto/aes-spe-glue.c
index 3a4ca7d32477..319f1dbb3a70 100644
--- a/arch/powerpc/crypto/aes-spe-glue.c
+++ b/arch/powerpc/crypto/aes-spe-glue.c
@@ -186,7 +186,6 @@ static int ppc_ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	unsigned int ubytes;
 	int err;
 
-	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	blkcipher_walk_init(&walk, dst, src, nbytes);
 	err = blkcipher_walk_virt(desc, &walk);
 
@@ -214,7 +213,6 @@ static int ppc_ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	unsigned int ubytes;
 	int err;
 
-	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	blkcipher_walk_init(&walk, dst, src, nbytes);
 	err = blkcipher_walk_virt(desc, &walk);
 
@@ -242,7 +240,6 @@ static int ppc_cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	unsigned int ubytes;
 	int err;
 
-	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	blkcipher_walk_init(&walk, dst, src, nbytes);
 	err = blkcipher_walk_virt(desc, &walk);
 
@@ -270,7 +267,6 @@ static int ppc_cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	unsigned int ubytes;
 	int err;
 
-	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	blkcipher_walk_init(&walk, dst, src, nbytes);
 	err = blkcipher_walk_virt(desc, &walk);
 
@@ -298,7 +294,6 @@ static int ppc_ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	unsigned int pbytes, ubytes;
 	int err;
 
-	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	blkcipher_walk_init(&walk, dst, src, nbytes);
 	err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
 
@@ -329,7 +324,6 @@ static int ppc_xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	int err;
 	u32 *twk;
 
-	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	blkcipher_walk_init(&walk, dst, src, nbytes);
 	err = blkcipher_walk_virt(desc, &walk);
 	twk = ctx->key_twk;
@@ -360,7 +354,6 @@ static int ppc_xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	int err;
 	u32 *twk;
 
-	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	blkcipher_walk_init(&walk, dst, src, nbytes);
 	err = blkcipher_walk_virt(desc, &walk);
 	twk = ctx->key_twk;
-- 
2.23.0