crypto: api - Add crypto_requires_off helper

This patch adds crypto_requires_off which is an extension of crypto_requires_sync for similar bits such as NEED_FALLBACK. Cc: [email protected] #4.10 Suggested-by: Marcelo Cerri <[email protected]> Signed-off-by: Herbert Xu <[email protected]>
ambv · Feb 27, 2017 · 016df0a · 016df0a
1 parent c884b36
commit 016df0a
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
@@ -360,13 +360,18 @@ static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
 	return crypto_attr_alg(tb[1], type, mask);
 }
 
+static inline int crypto_requires_off(u32 type, u32 mask, u32 off)
+{
+	return (type ^ off) & mask & off;
+}
+
 /*
  * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
  * Otherwise returns zero.
  */
 static inline int crypto_requires_sync(u32 type, u32 mask)
 {
-	return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
+	return crypto_requires_off(type, mask, CRYPTO_ALG_ASYNC);
 }
 
 noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);