stmmac: fix memory barriers
Fix up memory barriers in stmmac driver. They are meant to protect against DMA engine, so smp_ variants are certainly wrong, and dma_ variants are preferable. Signed-off-by: NPavel Machek <pavel@denx.de> Tested-by: NNiklas Cassel <niklas.cassel@axis.com> Acked-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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