[PATCH V3]: bugfix

V3:

+. submit two driver fix for warning message separately, and
it has already been accepted by netdev upstream

+. improve commit message

PS:

Does anyone has tx39 hardware? From tx39 kconfig, I can see it 
does NOT support High Memory, which is natural for old 32bit MIPS,
but I can not tell if it has dcache alias. My next patchset
depends on it

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