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authorRoopa Prabhu <roopa@cumulusnetworks.com>2018-07-20 13:21:01 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-28 07:49:12 +0200
commit19b74799159ab6f780fedd568adf00cdee9edd5a (patch)
treedebc173d113235b8a00634bae3b66aeda02d049f /net/ipv4/tcp_output.c
parentc6ac36be72e46082bedd4433ccba9925bbf6a322 (diff)
rtnetlink: add rtnl_link_state check in rtnl_configure_link
[ Upstream commit 5025f7f7d506fba9b39e7fe8ca10f6f34cb9bc2d ] rtnl_configure_link sets dev->rtnl_link_state to RTNL_LINK_INITIALIZED and unconditionally calls __dev_notify_flags to notify user-space of dev flags. current call sequence for rtnl_configure_link rtnetlink_newlink rtnl_link_ops->newlink rtnl_configure_link (unconditionally notifies userspace of default and new dev flags) If a newlink handler wants to call rtnl_configure_link early, we will end up with duplicate notifications to user-space. This patch fixes rtnl_configure_link to check rtnl_link_state and call __dev_notify_flags with gchanges = 0 if already RTNL_LINK_INITIALIZED. Later in the series, this patch will help the following sequence where a driver implementing newlink can call rtnl_configure_link to initialize the link early. makes the following call sequence work: rtnetlink_newlink rtnl_link_ops->newlink (vxlan) -> rtnl_configure_link (initializes link and notifies user-space of default dev flags) rtnl_configure_link (updates dev flags if requested by user ifm and notifies user-space of new dev flags) Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv4/tcp_output.c')
0 files changed, 0 insertions, 0 deletions