crypto: chcr - Avoid algo allocation in softirq.

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 <harsh@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 16 insertions, 8 deletions

diff --git a/drivers/crypto/chelsio/chcr_algo.c b/drivers/crypto/chelsio/chcr_algo.c
index aa4e5b88483d..508cbc79e508 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 a4f95b014b46..30af1ee17b87 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;