crypto: Add bulk algorithm registration interface

Hardware crypto engines frequently need to register a selection of
different algorithms with the core. Simplify their code slightly,
especially the error handling, by providing functions to register a
number of algorithms in a single call.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/algapi.c

@@ -405,6 +405,41 @@ int crypto_unregister_alg(struct crypto_alg *alg)
 }
 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 
+int crypto_register_algs(struct crypto_alg *algs, int count)
+{
+	int i, ret;
+
+	for (i = 0; i < count; i++) {
+		ret = crypto_register_alg(&algs[i]);
+		if (ret)
+			goto err;
+	}
+
+	return 0;
+
+err:
+	for (--i; i >= 0; --i)
+		crypto_unregister_alg(&algs[i]);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_register_algs);
+
+int crypto_unregister_algs(struct crypto_alg *algs, int count)
+{
+	int i, ret;
+
+	for (i = 0; i < count; i++) {
+		ret = crypto_unregister_alg(&algs[i]);
+		if (ret)
+			pr_err("Failed to unregister %s %s: %d\n",
+			       algs[i].cra_driver_name, algs[i].cra_name, ret);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_algs);
+
 int crypto_register_template(struct crypto_template *tmpl)
 {
 	struct crypto_template *q;

include/linux/crypto.h

@@ -314,6 +314,8 @@ struct crypto_alg {
  */
 int crypto_register_alg(struct crypto_alg *alg);
 int crypto_unregister_alg(struct crypto_alg *alg);
+int crypto_register_algs(struct crypto_alg *algs, int count);
+int crypto_unregister_algs(struct crypto_alg *algs, int count);
 
 /*
  * Algorithm query interface.