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at91_poll_err() allocates a can error SKB, to inform the user space
about the CAN error. Then it fills the SKB with information the error
information and increases the net device error stats.
In case no SBK can be allocated (e.g. due to an OOM) or the NAPI quota
is 0 the function is left early and no stats are updated. This is not
helpful to the user, as there is no information about the faulty CAN
bus.
Increase the error stats even if no quota is left or no SKB can be
allocated.
While there treat No-Acknowledgment as a bus error, too.
Link: https://lore.kernel.org/all/20231005-at91_can-rx_offload-v2-18-9987d53600e0@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
aa3f5d935c