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Subject[PATCH 4.4 12/56] crypto: vmx - disable preemption to enable vsx in aes_ctr.c
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Li Zhong <zhong@linux.vnet.ibm.com>


[ 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@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/crypto/vmx/aes_ctr.c | 6 ++++++
1 file changed, 6 insertions(+)

--- 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 cryp
int ret;
struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);

+ preempt_disable();
pagefault_disable();
enable_kernel_altivec();
enable_kernel_vsx();
ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
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_a
u8 *dst = walk->dst.virt.addr;
unsigned int nbytes = walk->nbytes;

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

crypto_xor(keystream, src, nbytes);
memcpy(dst, keystream, nbytes);
@@ -132,6 +136,7 @@ static int p8_aes_ctr_crypt(struct blkci
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_altivec();
enable_kernel_vsx();
@@ -143,6 +148,7 @@ static int p8_aes_ctr_crypt(struct blkci
&ctx->enc_key,
walk.iv);
pagefault_enable();
+ preempt_enable();

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

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