linux-kernel - [PATCH 4.4 12/56] crypto: vmx - disable preemption to enable vsx in aes

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Message-Id: <20171113125559.173411966@linuxfoundation.org>
Date:   Mon, 13 Nov 2017 13:55:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Li Zhong <zhong@...ux.vnet.ibm.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.4 12/56] crypto: vmx - disable preemption to enable vsx in aes_ctr.c

4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Li Zhong <zhong@...ux.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@...ux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;