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commitcb3cefe3f3upstream. Add clock rate zero check to fix coverity issue of "divide by 0". Fixes: commit85bd1798b2("net: fec: fix spin_lock dead lock") Signed-off-by: Fugang Duan <fugang.duan@nxp.com> Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>