sfc: The RX page_ring is optional

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commit 1d5a474240 upstream.

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: 2768935a46 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Martin Habets 2022-01-02 08:41:22 +00:00 • committed by Greg Kroah-Hartman

parent 03fb6db4ad

commit 8fbbc33cf0

2 changed files with 10 additions and 0 deletions

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5

drivers/net/ethernet/sfc/falcon/rx.c

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5

drivers/net/ethernet/sfc/rx_common.c

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