diff options
| author | Roopa Prabhu <roopa@cumulusnetworks.com> | 2018-07-20 13:21:01 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-28 07:45:02 +0200 |
| commit | b04c9a08710606e2fa0a16f24541a270c00ef58c (patch) | |
| tree | 6fa439bb329ffc2ec59510a37abbcae047a3235c /net | |
| parent | 73dad08709fee646875f5a81c07b05fb54582732 (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')
| -rw-r--r-- | net/core/rtnetlink.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 2017ffa5197a..96c9c0f0905a 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2087,9 +2087,12 @@ int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) return err; } - dev->rtnl_link_state = RTNL_LINK_INITIALIZED; - - __dev_notify_flags(dev, old_flags, ~0U); + if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) { + __dev_notify_flags(dev, old_flags, 0U); + } else { + dev->rtnl_link_state = RTNL_LINK_INITIALIZED; + __dev_notify_flags(dev, old_flags, ~0U); + } return 0; } EXPORT_SYMBOL(rtnl_configure_link); |