From: Florian Fainelli Date: Fri, 16 Jan 2015 17:56:01 +0000 (-0800) Subject: net: ipv4: handle DSA enabled master network devices X-Git-Tag: fixes-v4.0-rc1~150^2~167^2~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=728c02089a0e3eefb02e9927bfae50490f40e72e;p=pandora-kernel.git net: ipv4: handle DSA enabled master network devices The logic to configure a network interface for kernel IP auto-configuration is very simplistic, and does not handle the case where a device is stacked onto another such as with DSA. This causes the kernel not to open and configure the master network device in a DSA switch tree, and therefore slave network devices using this master network devices as conduit device cannot be open. This restriction comes from a check in net/dsa/slave.c, which is basically checking the master netdev flags for IFF_UP and returns -ENETDOWN if it is not the case. Automatically bringing-up DSA master network devices allows DSA slave network devices to be used as valid interfaces for e.g: NFS root booting by allowing kernel IP autoconfiguration to succeed on these interfaces. On the reverse path, make sure we do not attempt to close a DSA-enabled device as this would implicitely prevent the slave DSA network device from operating. Signed-off-by: Florian Fainelli Signed-off-by: David S. Miller --- Reading git-diff-tree failed