smsc95xx: Use skb_cow_head to deal with cloned skbs
authorJames Hughes <james.hughes@raspberrypi.org>
Wed, 19 Apr 2017 10:13:40 +0000 (11:13 +0100)
committerDavid S. Miller <davem@davemloft.net>
Thu, 20 Apr 2017 20:27:15 +0000 (16:27 -0400)
commite9156cd26a495a18706e796f02a81fee41ec14f4
tree1611a0f290429a70e0fbbecada5a825f2af0e324
parent74d209b8350a19d4f70252aa7a4e3d0b865676dd
smsc95xx: Use skb_cow_head to deal with cloned skbs

The driver was failing to check that the SKB wasn't cloned
before adding checksum data.
Replace existing handling to extend/copy the header buffer
with skb_cow_head.

Signed-off-by: James Hughes <james.hughes@raspberrypi.org>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Woojung Huh <Woojung.Huh@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/usb/smsc95xx.c