can: fix NOHZ local_softirq_pending 08 warning
When using nanosleep() in an userspace application we get a ratelimit warning NOHZ: local_softirq_pending 08 for 10 times. The echo of CAN frames is done from process context and softirq context only. Therefore the usage of netif_rx() was wrong (for years). This patch replaces netif_rx() with netif_rx_ni() which has to be used from process/softirq context. It also adds a missing comment that can_send() must no be used from hardirq context. Signed-off-by: NOliver Hartkopp <oliver@hartkopp.net> Signed-off-by: NUrs Thuermann <urs@isnogud.escape.de> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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