[PATCH] crypto: Move akcipher_request_cast helper to crypto header

[Corentin Labbe <clabbe@baylibre.com>]

There is already 2 driver implementing their own akcipher_request_cast.
In the future there will be also rockchip and allwinner driver that will
need this.
This is sufficient to move it in crypto headers.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
---
 drivers/crypto/aspeed/aspeed-acry.c | 6 ------
 drivers/crypto/ccp/ccp-crypto-rsa.c | 6 ------
 include/crypto/akcipher.h           | 7 +++++++
 3 files changed, 7 insertions(+), 12 deletions(-)

diff --git a/drivers/crypto/aspeed/aspeed-acry.c b/drivers/crypto/aspeed/aspeed-acry.c
index 247c568aa8df..ecb6e984367b 100644
--- a/drivers/crypto/aspeed/aspeed-acry.c
+++ b/drivers/crypto/aspeed/aspeed-acry.c
@@ -137,12 +137,6 @@ enum aspeed_rsa_key_mode {
 	ASPEED_RSA_DATA_MODE,
 };
 
-static inline struct akcipher_request *
-	akcipher_request_cast(struct crypto_async_request *req)
-{
-	return container_of(req, struct akcipher_request, base);
-}
-
 static int aspeed_acry_do_fallback(struct akcipher_request *req)
 {
 	struct crypto_akcipher *cipher = crypto_akcipher_reqtfm(req);
diff --git a/drivers/crypto/ccp/ccp-crypto-rsa.c b/drivers/crypto/ccp/ccp-crypto-rsa.c
index a14f85512cf4..32c9f524f3d5 100644
--- a/drivers/crypto/ccp/ccp-crypto-rsa.c
+++ b/drivers/crypto/ccp/ccp-crypto-rsa.c
@@ -19,12 +19,6 @@
 
 #include "ccp-crypto.h"
 
-static inline struct akcipher_request *akcipher_request_cast(
-	struct crypto_async_request *req)
-{
-	return container_of(req, struct akcipher_request, base);
-}
-
 static inline int ccp_copy_and_save_keypart(u8 **kpbuf, unsigned int *kplen,
 					    const u8 *buf, size_t sz)
 {
diff --git a/include/crypto/akcipher.h b/include/crypto/akcipher.h
index 670508f1dca1..4b6e610db18d 100644
--- a/include/crypto/akcipher.h
+++ b/include/crypto/akcipher.h
@@ -498,4 +498,11 @@ static inline int crypto_akcipher_set_priv_key(struct crypto_akcipher *tfm,
 
 	return alg->set_priv_key(tfm, key, keylen);
 }
+
+static inline struct akcipher_request *
+	akcipher_request_cast(struct crypto_async_request *req)
+{
+	return container_of(req, struct akcipher_request, base);
+}
+
 #endif
-- 
2.41.0