[PATCH V3 resend]: bugfix

[Huang Pei <huangpei@xxxxxxxxxxx>]

V3:

+. submit two driver fixes for warning message separately, which has
been accepted by netdev upstream

+. improve commit message of PATCH 4/4;

PS:

Does anyone have tx39's hardware, or anyone knows if tx39 has Dcache
alias? I can only tell that tx39 does not support High Memory