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net: set name assign type for renamed devices 

Based on a patch from David Herrmann.

This is the only place devices can be renamed.

v9: restore revers-christmas-tree order of local variables

Signed-off-by: Tom Gundersen <teg@jklm.no>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Gundersen 2014-07-14 16:37:23 +02:00 committed by David S. Miller
parent 685343fc3b
commit 238fa3623a
1 changed files with 7 additions and 0 deletions
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7
net/core/dev.c
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@ -1082,6 +1082,7 @@ static int dev_get_valid_name(struct net *net,
*/
int dev_change_name(struct net_device *dev, const char *newname)
{
unsigned char old_assign_type;
char oldname[IFNAMSIZ];
int err = 0;
int ret;
@ -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",