commit 1fc2257e837f86c2688fdcc5c8810b73c133794d
author Jiri Pirko <jiri@mellanox.com> Fri Apr 08 19:12:48 2016 +0200
committer David S. Miller <davem@davemloft.net> Fri Apr 08 15:40:08 2016 -0400
tree 83ad768f616aac1b0e5e9f0e2c9f09dbdfcdc7d6
parent 67b5b21f389502c3fb18b46d4fa9d02c38982fce

devlink: share user_ptr pointer for both devlink and devlink_port

Ptr to devlink structure can be easily obtained from
devlink_port->devlink. So share user_ptr[0] pointer for both and leave
user_ptr[1] free for other users.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/devlink.c

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 44f880d..b84cf0d 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -119,7 +119,8 @@
 	return devlink_port_get_from_attrs(devlink, info->attrs);
 }
 
-#define DEVLINK_NL_FLAG_NEED_PORT	BIT(0)
+#define DEVLINK_NL_FLAG_NEED_DEVLINK	BIT(0)
+#define DEVLINK_NL_FLAG_NEED_PORT	BIT(1)
 
 static int devlink_nl_pre_doit(const struct genl_ops *ops,
 			       struct sk_buff *skb, struct genl_info *info)
@@ -132,8 +133,9 @@
 		mutex_unlock(&devlink_mutex);
 		return PTR_ERR(devlink);
 	}
-	info->user_ptr[0] = devlink;
-	if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_PORT) {
+	if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_DEVLINK) {
+		info->user_ptr[0] = devlink;
+	} else if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_PORT) {
 		struct devlink_port *devlink_port;
 
 		mutex_lock(&devlink_port_mutex);
@@ -143,7 +145,7 @@
 			mutex_unlock(&devlink_mutex);
 			return PTR_ERR(devlink_port);
 		}
-		info->user_ptr[1] = devlink_port;
+		info->user_ptr[0] = devlink_port;
 	}
 	return 0;
 }
@@ -356,8 +358,8 @@
 static int devlink_nl_cmd_port_get_doit(struct sk_buff *skb,
 					struct genl_info *info)
 {
-	struct devlink *devlink = info->user_ptr[0];
-	struct devlink_port *devlink_port = info->user_ptr[1];
+	struct devlink_port *devlink_port = info->user_ptr[0];
+	struct devlink *devlink = devlink_port->devlink;
 	struct sk_buff *msg;
 	int err;
 
@@ -436,8 +438,8 @@
 static int devlink_nl_cmd_port_set_doit(struct sk_buff *skb,
 					struct genl_info *info)
 {
-	struct devlink *devlink = info->user_ptr[0];
-	struct devlink_port *devlink_port = info->user_ptr[1];
+	struct devlink_port *devlink_port = info->user_ptr[0];
+	struct devlink *devlink = devlink_port->devlink;
 	int err;
 
 	if (info->attrs[DEVLINK_ATTR_PORT_TYPE]) {
@@ -511,6 +513,7 @@
 		.doit = devlink_nl_cmd_get_doit,
 		.dumpit = devlink_nl_cmd_get_dumpit,
 		.policy = devlink_nl_policy,
+		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
 		/* can be retrieved by unprivileged users */
 	},
 	{
@@ -533,12 +536,14 @@
 		.doit = devlink_nl_cmd_port_split_doit,
 		.policy = devlink_nl_policy,
 		.flags = GENL_ADMIN_PERM,
+		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
 	},
 	{
 		.cmd = DEVLINK_CMD_PORT_UNSPLIT,
 		.doit = devlink_nl_cmd_port_unsplit_doit,
 		.policy = devlink_nl_policy,
 		.flags = GENL_ADMIN_PERM,
+		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
 	},
 };