From: Eric Biggers <ebiggers@xxxxxxxxxx>
To improve responsivesess, disable preemption for each step of the walk
(which is at most PAGE_SIZE) rather than for the entire
encryption/decryption operation.
Suggested-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
arch/arm/crypto/chacha20-neon-glue.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/arm/crypto/chacha20-neon-glue.c b/arch/arm/crypto/chacha20-neon-glue.c
index 7386eb1c1889..2bc035cb8f23 100644
--- a/arch/arm/crypto/chacha20-neon-glue.c
+++ b/arch/arm/crypto/chacha20-neon-glue.c
@@ -68,22 +68,22 @@ static int chacha20_neon(struct skcipher_request *req)
if (req->cryptlen <= CHACHA_BLOCK_SIZE || !may_use_simd())
return crypto_chacha_crypt(req);
- err = skcipher_walk_virt(&walk, req, true);
+ err = skcipher_walk_virt(&walk, req, false);
crypto_chacha_init(state, ctx, walk.iv);
- kernel_neon_begin();
while (walk.nbytes > 0) {
unsigned int nbytes = walk.nbytes;
if (nbytes < walk.total)
nbytes = round_down(nbytes, walk.stride);
+ kernel_neon_begin();
chacha20_doneon(state, walk.dst.virt.addr, walk.src.virt.addr,
nbytes);
+ kernel_neon_end();
err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
}
- kernel_neon_end();
return err;
}
--
2.19.1.930.g4563a0d9d0-goog
