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Subject[PATCH v8 2/4] net: set name assign type for renamed devices
Date
Based on a patch from David Herrmann.

This is the only place devices can be renamed.

Signed-off-by: Tom Gundersen <teg@jklm.no>
Reviewed-by: David Herrmann <dh.herrmann@gmail.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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