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net: axienet: allow setups without MDIO
[ Upstream commit de9c785 ] In setups with fixed-link settings there is no mdio node in DTS. axienet_probe() already handles that gracefully but lp->mii_bus is then NULL. Fix code that tries to blindly grab the MDIO lock by introducing two helper functions that make the locking conditional. Signed-off-by: Daniel Mack <daniel@zonque.org> Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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