tg3: Fix link check in tg3_adjust_link
The tg3 driver tried to detect link changes by comparing the tg3 local active_speed member with SPEED_UNKNOWN (or formerly SPEED_INVALID). This check is not correct, since phylib will never set its speed member to either of these two values. The code only appeared to work because tg3 initializes active_speed to SPEED_INVALID during tg3_init_one. This patch introduces a new "old_link" tg3 member and then compares the phy_device's link member against it to detect link state changes. Signed-off-by: NMatt Carlson <mcarlson@broadcom.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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