stmmac: add last_segment field to dma data
last_segment field is read twice from dma descriptors in stmmac_clean(). Add last_segment to dma data so that this flag is from priv structure in cache instead of memory. It avoids reading twice from memory for each loop in stmmac_clean(). Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com> Signed-off-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: NAlexandre TORGUE <alexandre.torgue@st.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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