bna: check for dma mapping errors
Check for DMA mapping errors, recover from them and register them in ethtool stats like other errors. Cc: Rasesh Mody <rasesh.mody@qlogic.com> Signed-off-by: NIvan Vecera <ivecera@redhat.com> Acked-by: NRasesh Mody <rasesh.mody@qlogic.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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