From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Date: Sun, 12 Nov 2017 23:15:10 +0000 (+0100)
Subject: net: core: dev_get_valid_name is now the same as dev_alloc_name_ns
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=87c320e51519a83c496ab7bfb4e96c8f9c001e89;p=linux.git

net: core: dev_get_valid_name is now the same as dev_alloc_name_ns

If name contains a %, it's easy to see that this patch doesn't change
anything (other than eliminate the duplicate dev_valid_name
call). Otherwise, we'll now just spend a little time in snprintf()
copying name to the stack buffer allocated in dev_alloc_name_ns, and do
the __dev_get_by_name using that buffer rather than name.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/dev.c b/net/core/dev.c
index 1bb856eaed1c4..ad5f90dacd92b 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1146,19 +1146,7 @@ EXPORT_SYMBOL(dev_alloc_name);
 int dev_get_valid_name(struct net *net, struct net_device *dev,
 		       const char *name)
 {
-	BUG_ON(!net);
-
-	if (!dev_valid_name(name))
-		return -EINVAL;
-
-	if (strchr(name, '%'))
-		return dev_alloc_name_ns(net, dev, name);
-	else if (__dev_get_by_name(net, name))
-		return -EEXIST;
-	else if (dev->name != name)
-		strlcpy(dev->name, name, IFNAMSIZ);
-
-	return 0;
+	return dev_alloc_name_ns(net, dev, name);
 }
 EXPORT_SYMBOL(dev_get_valid_name);