arm64: dts: rockchip: add otg-port node of usb2-phy for rk3328 dwc2

[firefly-linux-kernel-4.4.55.git] / crypto / crypto_null.c

diff --git a/crypto/crypto_null.c b/crypto/crypto_null.c
index fee7265cd35df5aa3d752e3294cb0f50fada64d2..941c9a434d50f9480e0a8dc456b87e80c3a80ff7 100644 (file)
--- a/crypto/crypto_null.c
+++ b/crypto/crypto_null.c
@@ -17,6 +17,7 @@
  *
  */
 
+#include <crypto/null.h>
 #include <crypto/internal/hash.h>
 #include <crypto/internal/skcipher.h>
 #include <linux/init.h>
@@ -24,10 +25,9 @@
 #include <linux/mm.h>
 #include <linux/string.h>
 
-#define NULL_KEY_SIZE          0
-#define NULL_BLOCK_SIZE                1
-#define NULL_DIGEST_SIZE       0
-#define NULL_IV_SIZE           0
+static DEFINE_MUTEX(crypto_default_null_skcipher_lock);
+static struct crypto_blkcipher *crypto_default_null_skcipher;
+static int crypto_default_null_skcipher_refcnt;
 
 static int null_compress(struct crypto_tfm *tfm, const u8 *src,
                         unsigned int slen, u8 *dst, unsigned int *dlen)
@@ -149,9 +149,44 @@ static struct crypto_alg null_algs[3] = { {
        .coa_decompress         =       null_compress } }
 } };
 
-MODULE_ALIAS("compress_null");
-MODULE_ALIAS("digest_null");
-MODULE_ALIAS("cipher_null");
+MODULE_ALIAS_CRYPTO("compress_null");
+MODULE_ALIAS_CRYPTO("digest_null");
+MODULE_ALIAS_CRYPTO("cipher_null");
+
+struct crypto_blkcipher *crypto_get_default_null_skcipher(void)
+{
+       struct crypto_blkcipher *tfm;
+
+       mutex_lock(&crypto_default_null_skcipher_lock);
+       tfm = crypto_default_null_skcipher;
+
+       if (!tfm) {
+               tfm = crypto_alloc_blkcipher("ecb(cipher_null)", 0, 0);
+               if (IS_ERR(tfm))
+                       goto unlock;
+
+               crypto_default_null_skcipher = tfm;
+       }
+
+       crypto_default_null_skcipher_refcnt++;
+
+unlock:
+       mutex_unlock(&crypto_default_null_skcipher_lock);
+
+       return tfm;
+}
+EXPORT_SYMBOL_GPL(crypto_get_default_null_skcipher);
+
+void crypto_put_default_null_skcipher(void)
+{
+       mutex_lock(&crypto_default_null_skcipher_lock);
+       if (!--crypto_default_null_skcipher_refcnt) {
+               crypto_free_blkcipher(crypto_default_null_skcipher);
+               crypto_default_null_skcipher = NULL;
+       }
+       mutex_unlock(&crypto_default_null_skcipher_lock);
+}
+EXPORT_SYMBOL_GPL(crypto_put_default_null_skcipher);
 
 static int __init crypto_null_mod_init(void)
 {