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sfc: on MC reset, clear PIO buffer linkage in TXQs
Otherwise, if we fail to allocate new PIO buffers, our TXQs will try to use the old ones, which aren't there any more. Fixes: 183233b "sfc: Allocate and link PIO buffers; map them with write-combining" Signed-off-by: Edward Cree <ecree@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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