IB/ipoib: Grab rtnl lock on heavy flush when calling ndo_open/stop
When ndo_open and ndo_stop are called RTNL lock should be held.
In this specific case ipoib_ib_dev_open calls the offloaded ndo_open
which re-sets the number of TX queue assuming RTNL lock is held.
Since RTNL lock is not held, RTNL assert will fail.
Signed-off-by: NAlex Vesker <valex@mellanox.com>
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