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sxgbe_open() ignores the return value of init_dma_desc_rings() and
continues to program DMA with invalid ring addresses when allocation
fails. Check the return value and disconnect the PHY on failure.
Fixes: 1edb9ca69e ("net: sxgbe: add basic framework for Samsung 10Gb ethernet driver")
Signed-off-by: Chenguang Zhao <zhaochenguang@kylinos.cn>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>