Re: can: m_can: tcan4x5x m_can_isr do not handle tx if rx fails

[Michael Anochin <anochin@xxxxxxxxxxxxxxx>]

With netdev_warn() in m_can_tx_handler I found,
that before "BUG! echo_skb N" appears,

m_can_next_echo_skb_occupied(dev, putidx) is true with putidx=N-1



[11676.933800] tcan4x5x spi4.0 can1: m_can_tx_handler m_can_tx_fifo_full 
or m_can_next_echo_skb_occupied, putidx=12

[11676.934735] tcan4x5x spi4.0 can1: m_can_start_xmit: enter

[11676.934744] tcan4x5x spi4.0 can1: m_can_start_xmit netif_stop_queue done

[11676.934911] tcan4x5x spi4.0 can1: can_put_echo_skb: BUG! echo_skb 13 
is occupied!