crypto: api - Add __crypto_alloc_tfmgfp

Use it straight away in crypto_clone_cipher(), as that is not meant to
sleep.

Fixes: 51d8d6d ("crypto: cipher - Add crypto_clone_cipher")
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Author: herbertx

crypto/api.c

@@ -386,15 +386,15 @@ void crypto_shoot_alg(struct crypto_alg *alg)
 }
 EXPORT_SYMBOL_GPL(crypto_shoot_alg);
 
-struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
-				      u32 mask)
+struct crypto_tfm *__crypto_alloc_tfmgfp(struct crypto_alg *alg, u32 type,
+					 u32 mask, gfp_t gfp)
 {
 	struct crypto_tfm *tfm = NULL;
 	unsigned int tfm_size;
 	int err = -ENOMEM;
 
 	tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
-	tfm = kzalloc(tfm_size, GFP_KERNEL);
+	tfm = kzalloc(tfm_size, gfp);
 	if (tfm == NULL)
 		goto out_err;
 
@@ -416,6 +416,13 @@ struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
 out:
 	return tfm;
 }
+EXPORT_SYMBOL_GPL(__crypto_alloc_tfmgfp);
+
+struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
+				      u32 mask)
+{
+	return __crypto_alloc_tfmgfp(alg, type, mask, GFP_KERNEL);
+}
 EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
 
 /*

crypto/cipher.c

@@ -101,8 +101,8 @@ struct crypto_cipher *crypto_clone_cipher(struct crypto_cipher *cipher)
 	if (alg->cra_init)
 		return ERR_PTR(-ENOSYS);
 
-	ntfm = __crypto_alloc_tfm(alg, CRYPTO_ALG_TYPE_CIPHER,
-				  CRYPTO_ALG_TYPE_MASK);
+	ntfm = __crypto_alloc_tfmgfp(alg, CRYPTO_ALG_TYPE_CIPHER,
+				     CRYPTO_ALG_TYPE_MASK, GFP_ATOMIC);
 	if (IS_ERR(ntfm))
 		return ERR_CAST(ntfm);
 

crypto/internal.h

@@ -102,6 +102,8 @@ void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 			  struct crypto_alg *nalg);
 void crypto_remove_final(struct list_head *list);
 void crypto_shoot_alg(struct crypto_alg *alg);
+struct crypto_tfm *__crypto_alloc_tfmgfp(struct crypto_alg *alg, u32 type,
+					 u32 mask, gfp_t gfp);
 struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
 				      u32 mask);
 void *crypto_create_tfm_node(struct crypto_alg *alg,