[PATCH AUTOSEL for 4.9 19/50] crypto: vmx - disable preemption to enable vsx in aes_ctr.c

From: Levin, Alexander (Sasha Levin)
Date: Tue Oct 24 2017 - 21:57:20 EST


From: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx>

[ Upstream commit 7dede913fc2ab9c0d3bff3a49e26fa9e858b0c13 ]

Some preemptible check warnings were reported from enable_kernel_vsx(). This
patch disables preemption in aes_ctr.c before enabling vsx, and they are now
consistent with other files in the same directory.

Signed-off-by: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
---
drivers/crypto/vmx/aes_ctr.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/crypto/vmx/aes_ctr.c b/drivers/crypto/vmx/aes_ctr.c
index 38ed10d761d0..7cf6d31c1123 100644
--- a/drivers/crypto/vmx/aes_ctr.c
+++ b/drivers/crypto/vmx/aes_ctr.c
@@ -80,11 +80,13 @@ static int p8_aes_ctr_setkey(struct crypto_tfm *tfm, const u8 *key,
int ret;
struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);

+ preempt_disable();
pagefault_disable();
enable_kernel_vsx();
ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
disable_kernel_vsx();
pagefault_enable();
+ preempt_enable();

ret += crypto_blkcipher_setkey(ctx->fallback, key, keylen);
return ret;
@@ -99,11 +101,13 @@ static void p8_aes_ctr_final(struct p8_aes_ctr_ctx *ctx,
u8 *dst = walk->dst.virt.addr;
unsigned int nbytes = walk->nbytes;

+ preempt_disable();
pagefault_disable();
enable_kernel_vsx();
aes_p8_encrypt(ctrblk, keystream, &ctx->enc_key);
disable_kernel_vsx();
pagefault_enable();
+ preempt_enable();

crypto_xor(keystream, src, nbytes);
memcpy(dst, keystream, nbytes);
@@ -132,6 +136,7 @@ static int p8_aes_ctr_crypt(struct blkcipher_desc *desc,
blkcipher_walk_init(&walk, dst, src, nbytes);
ret = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
+ preempt_disable();
pagefault_disable();
enable_kernel_vsx();
aes_p8_ctr32_encrypt_blocks(walk.src.virt.addr,
@@ -143,6 +148,7 @@ static int p8_aes_ctr_crypt(struct blkcipher_desc *desc,
walk.iv);
disable_kernel_vsx();
pagefault_enable();
+ preempt_enable();

/* We need to update IV mostly for last bytes/round */
inc = (nbytes & AES_BLOCK_MASK) / AES_BLOCK_SIZE;
--
2.11.0