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From: Wolfgang Grandegger <wg@grandegger.com>
To: xenomai@xenomai.org
Subject: Re: [Xenomai] RTcan: Assertation failed
Date: Mon, 26 Sep 2016 14:55:55 +0200	[thread overview]
Message-ID: <26ca535c-fc89-5482-c2f4-e2ebd898e056@grandegger.com> (raw)
In-Reply-To: <984827b9-0e03-f90c-f269-ceaa42cd4d4c@grandegger.com>

Hello,

more on that subject:

Am 26.09.2016 um 14:04 schrieb Wolfgang Grandegger:
> Hello,
>
> Am 26.09.2016 um 09:49 schrieb Jack Lee:
>>
>>  [ 5911.271780] rtcan0: real bitrate 1000000, sampling point 75.0%
>>  [ 5911.271806] rtcan_sja_set_bit_time: btr0=0x0 btr1=0x14
>>  [ 5911.271868] Assertion failed!
>>  drivers/xenomai/can/rtcan_raw.c:rtcan_tx_push:178 dev->tx_socket == 0
>>  [ 5911.271872] (1) TX skb still in use
>>  [ 6011.087098] rtcan0: real bitrate 1000000, sampling point 75.0%
>>  [ 6011.087119] rtcan_sja_set_bit_time: btr0=0x0 btr1=0x14
>>  [ 7985.615408] perf interrupt took too long (2512 > 2500), lowering
>>  kernel.perf_event_max_sample_rate to 50000
>>
>>
>> Hi, Wolfgang,
>>
>> I got this error with my advantech PCM26D2CA CAN-board when real-time
>> applications were running.
>>
>> The PCM26D2CA board has two ports: "rtcan0" was used by user
>> applications and "rtcan1" was used by "rtcanrecv" to monitor CAN bus.
>>
>> The bitrate was set previously and not set explicitly here.
>
> What do you mean? It looks like bitrate was set while the interface was
> active... which should not be allowed. But unfortunately, it is. Anyway,
> I can not see how that function is called accidentally. Must be done
> somehow by you system. Or are there any other related messages in kernel
> log (dmesg) indicating that there was a bus error.

I had a closer look to the code. Actually it's allowed to set the 
bit-timing while interface is active. It will be stopped and restarted 
afterwards... but the reset of the loopback handling is missing. That 
needs a fix.

Wolfgang.


  reply	other threads:[~2016-09-26 12:55 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-26  7:49 [Xenomai] RTcan: Assertation failed Jack Lee
2016-09-26 12:04 ` Wolfgang Grandegger
2016-09-26 12:55   ` Wolfgang Grandegger [this message]
     [not found] <27f25f2c-b872-9c8f-9068-bb3e8d3e1d1e@foxmail.com>
2016-09-27  1:57 ` Jack Lee
2016-09-27  6:13   ` Wolfgang Grandegger

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