netdev - [PATCH v8 2/4] net: set name assign type for renamed devices

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Message-Id: <1405026066-2547-3-git-send-email-teg@jklm.no>
Date:	Thu, 10 Jul 2014 23:01:04 +0200
From:	Tom Gundersen <teg@...m.no>
To:	netdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	David Herrmann <dh.herrmann@...il.com>,
	Kay Sievers <kay@...y.org>, Tom Gundersen <teg@...m.no>
Subject: [PATCH v8 2/4] net: set name assign type for renamed devices

Based on a patch from David Herrmann.

This is the only place devices can be renamed.

Signed-off-by: Tom Gundersen <teg@...m.no>
Reviewed-by: David Herrmann <dh.herrmann@...il.com>
---
 net/core/dev.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index 392c784..5d7b2a6 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1083,6 +1083,7 @@ static int dev_get_valid_name(struct net *net,
 int dev_change_name(struct net_device *dev, const char *newname)
 {
 	char oldname[IFNAMSIZ];
+	unsigned char old_assign_type;
 	int err = 0;
 	int ret;
 	struct net *net;
@@ -1109,10 +1110,14 @@ int dev_change_name(struct net_device *dev, const char *newname)
 		return err;
 	}
 
+	old_assign_type = dev->name_assign_type;
+	dev->name_assign_type = NET_NAME_RENAMED;
+
 rollback:
 	ret = device_rename(&dev->dev, dev->name);
 	if (ret) {
 		memcpy(dev->name, oldname, IFNAMSIZ);
+		dev->name_assign_type = old_assign_type;
 		write_seqcount_end(&devnet_rename_seq);
 		return ret;
 	}
@@ -1141,6 +1146,8 @@ rollback:
 			write_seqcount_begin(&devnet_rename_seq);
 			memcpy(dev->name, oldname, IFNAMSIZ);
 			memcpy(oldname, newname, IFNAMSIZ);
+			dev->name_assign_type = old_assign_type;
+			old_assign_type = NET_NAME_RENAMED;
 			goto rollback;
 		} else {
 			pr_err("%s: name change rollback failed: %d\n",
-- 
1.9.3

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