r8169: spinlock redux.
rtl8169_get_regs operates under RTNL and rtl task mutex whereas
rtl_set_rx_mode is either called under RTNL or rtl task mutex protection.
Signed-off-by: NFrancois Romieu <romieu@fr.zoreil.com>
Cc: Hayes Wang <hayeswang@realtek.com>
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