42d8c91e for drivers/net/phy/realtek.c causing loss on Banana Pi

[Marc Haber]

Hi,

in kernel 5.9, my Banana Pi test systems suffers from catastrophic
packet loss on the Ethernet that makes the machine nearly unusable.
Reverting bbc4d71d63549bcd003a430de18a72a742d8c91e fixes the issue for
me.

Please investigate the breakage caused by this commit. I am prepared to
help with testing and would appreciate a fix even in Greg's stable
releases.

Greetings
Marc

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