[PATCH] crypto: chcr: Avoid algo allocation in softirq.

[Harsh Jain]

Thsi patch fixes calling "crypto_alloc_cipher" call in bottom halves.
Pre allocate aes cipher required to update Tweak value for XTS.

Signed-off-by: Harsh Jain <ha...@chelsio.com>
---
 drivers/crypto/chelsio/chcr_algo.c   | 23 +++++++++++++++--------
 drivers/crypto/chelsio/chcr_crypto.h |  1 +
 2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/crypto/chelsio/chcr_algo.c 
b/drivers/crypto/chelsio/chcr_algo.c
index aa4e5b8..508cbc7 100644
--- a/drivers/crypto/chelsio/chcr_algo.c
+++ b/drivers/crypto/chelsio/chcr_algo.c
@@ -899,26 +899,20 @@ static int chcr_update_tweak(struct ablkcipher_request 
*req, u8 *iv)
        u8 *key;
        unsigned int keylen;
 
-       cipher = crypto_alloc_cipher("aes-generic", 0, 0);
+       cipher = ablkctx->aes_generic;
        memcpy(iv, req->info, AES_BLOCK_SIZE);
 
-       if (IS_ERR(cipher)) {
-               ret = -ENOMEM;
-               goto out;
-       }
        keylen = ablkctx->enckey_len / 2;
        key = ablkctx->key + keylen;
        ret = crypto_cipher_setkey(cipher, key, keylen);
        if (ret)
-               goto out1;
+               goto out;
 
        crypto_cipher_encrypt_one(cipher, iv, iv);
        for (i = 0; i < (reqctx->processed / AES_BLOCK_SIZE); i++)
                gf128mul_x_ble((le128 *)iv, (le128 *)iv);
 
        crypto_cipher_decrypt_one(cipher, iv, iv);
-out1:
-       crypto_free_cipher(cipher);
 out:
        return ret;
 }
@@ -1262,6 +1256,17 @@ static int chcr_cra_init(struct crypto_tfm *tfm)
                pr_err("failed to allocate fallback for %s\n", alg->cra_name);
                return PTR_ERR(ablkctx->sw_cipher);
        }
+
+       if (get_cryptoalg_subtype(tfm) == CRYPTO_ALG_SUB_TYPE_XTS) {
+               /* To update tweak*/
+               ablkctx->aes_generic = crypto_alloc_cipher("aes-generic", 0, 0);
+               if (IS_ERR(ablkctx->aes_generic)) {
+                       pr_err("failed to allocate aes cipher for tweak\n");
+                       return PTR_ERR(ablkctx->aes_generic);
+               }
+       } else
+               ablkctx->aes_generic = NULL;
+
        tfm->crt_ablkcipher.reqsize =  sizeof(struct chcr_blkcipher_req_ctx);
        return chcr_device_init(crypto_tfm_ctx(tfm));
 }
@@ -1292,6 +1297,8 @@ static void chcr_cra_exit(struct crypto_tfm *tfm)
        struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
 
        crypto_free_skcipher(ablkctx->sw_cipher);
+       if (ablkctx->aes_generic)
+               crypto_free_cipher(ablkctx->aes_generic);
 }
 
 static int get_alg_config(struct algo_param *params,
diff --git a/drivers/crypto/chelsio/chcr_crypto.h 
b/drivers/crypto/chelsio/chcr_crypto.h
index a4f95b0..30af1ee 100644
--- a/drivers/crypto/chelsio/chcr_crypto.h
+++ b/drivers/crypto/chelsio/chcr_crypto.h
@@ -155,6 +155,7 @@
 
 struct ablk_ctx {
        struct crypto_skcipher *sw_cipher;
+       struct crypto_cipher *aes_generic;
        __be32 key_ctx_hdr;
        unsigned int enckey_len;
        unsigned char ciph_mode;
-- 
2.1.4