Re: CAN State Information

[Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>]

On 12/09/2011 09:03 AM, kime-Z4QKGCRq86k@public.gmane.org wrote:
> I plan to spend some time today tracking down the problem.  I am most curious to discover if there is a problem in the msg returned from send_dump_request(). 
> 
> $ sudo ./canconfig can0 state
> can0 state: STOPPED
> $ sudo ./canconfig can1 state
> can1 state: STOPPED
> $ "
> can2: failed to get state 
> $ sudo ./canconfig can3 state
> can3: failed to get state 

OK, what does strace tell you. Is there a system call failing with "-1"?
Also ftrace could give some hint (assuming that ftrace and function
tracing is enabled in you kernel):

  # mount -tdebugfs none /sys/kernel/debug/
  # cd /sys/kernel/debug/tracing/
  # echo function > current_tracer
  # echo "can_*" >  set_ftrace_filter
  # cat set_ftrace_filter
  # echo 0 > trace

What does /sys/kernel/debug/tracing/trace list after calling "sudo
./canconfig can2 state"?

Wolfgang.