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The RX page_ring is an optional feature that improves performance. When allocation fails the driver can still function, but possibly with a lower bandwidth. Guard against dereferencing a NULL page_ring. Fixes: 2768935 ("sfc: reuse pages to avoid DMA mapping/unmapping costs") Signed-off-by: Martin Habets <habetsm.xilinx@gmail.com> Reported-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> Link: https://lore.kernel.org/r/164111288276.5798.10330502993729113868.stgit@palantir17.mph.net Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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