genetlink: Introduce genl_register_family_with_ops()

This introduces genl_register_family_with_ops() that registers a genetlink
family along with operations from a table. This is used to kill copy'n'paste
occurrences in following patches.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index 747c255..1b0e3ee 100644 (file)
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -88,6 +88,8 @@ struct genl_ops
 };
 
 extern int genl_register_family(struct genl_family *family);
+extern int genl_register_family_with_ops(struct genl_family *family,
+       struct genl_ops *ops, size_t n_ops);
 extern int genl_unregister_family(struct genl_family *family);
 extern int genl_register_ops(struct genl_family *, struct genl_ops *ops);
 extern int genl_unregister_ops(struct genl_family *, struct genl_ops *ops);

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 1d3dd30..eed4c6a 100644 (file)
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -384,6 +384,52 @@ errout:
 }
 
 /**
+ * genl_register_family_with_ops - register a generic netlink family
+ * @family: generic netlink family
+ * @ops: operations to be registered
+ * @n_ops: number of elements to register
+ *
+ * Registers the specified family and operations from the specified table.
+ * Only one family may be registered with the same family name or identifier.
+ *
+ * The family id may equal GENL_ID_GENERATE causing an unique id to
+ * be automatically generated and assigned.
+ *
+ * Either a doit or dumpit callback must be specified for every registered
+ * operation or the function will fail. Only one operation structure per
+ * command identifier may be registered.
+ *
+ * See include/net/genetlink.h for more documenation on the operations
+ * structure.
+ *
+ * This is equivalent to calling genl_register_family() followed by
+ * genl_register_ops() for every operation entry in the table taking
+ * care to unregister the family on error path.
+ *
+ * Return 0 on success or a negative error code.
+ */
+int genl_register_family_with_ops(struct genl_family *family,
+       struct genl_ops *ops, size_t n_ops)
+{
+       int err, i;
+
+       err = genl_register_family(family);
+       if (err)
+               return err;
+
+       for (i = 0; i < n_ops; ++i, ++ops) {
+               err = genl_register_ops(family, ops);
+               if (err)
+                       goto err_out;
+       }
+       return 0;
+err_out:
+       genl_unregister_family(family);
+       return err;
+}
+EXPORT_SYMBOL(genl_register_family_with_ops);
+
+/**
  * genl_unregister_family - unregister generic netlink family
  * @family: generic netlink family
  *