From mboxrd@z Thu Jan  1 00:00:00 1970
From: Oliver Hartkopp <socketcan@hartkopp.net>
Subject: Re: sja1000 interrupt problem
Date: Sat, 09 Nov 2013 15:21:31 +0100
Message-ID: <527E44EB.9020605@hartkopp.net>
References: <CANGgnMZTugYEZDi5wrmFVP5K=ZMhKsgZJ5VQLP6Y0nxbCsDZ7w@mail.gmail.com> <3a4a0c6ac898fbe27a8fe95cb147634c@grandegger.com> <99984642-b542-4078-a5ba-3dfb66188ce5@email.android.com> <CANGgnMb130WSkOkreRyRg9cXhMn=MXhGmhMqXKMOTkiTMD4vqQ@mail.gmail.com> <5254608B.4080208@grandegger.com> <CANGgnMYN3epBb_b=AywUQbN_LQLu6C6ebCfE0xifzoS0Yw1y1g@mail.gmail.com> <be0d6725fff5298d3fb8417e4800348b@grandegger.com> <CANGgnMZpPGctUWGcg7Lp-QFPc7d6A5GeL9KQYnpeYMR8WukgdA@mail.gmail.com> <84ba410d04a85a783d1c1994f98d1f31@grandegger.com> <CANGgnMY4noiSSTXcuOJo36BXZhh0qOrJN_OXx8EZXE0_Gq4Z1g@mail.gmail.com>
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To: Austin Schuh <austin@peloton-tech.com>
Cc: Wolfgang Grandegger <wg@grandegger.com>, linux-can@vger.kernel.org

Hello Austin,

from the trace I assume that you connected the two CAN interfaces which each
other and you get the tx-complete interrupt very close to the rx interrupt.

(1) Is this assumed setup correct?

>From the trace it is pretty hard to know which CAN interface is in charge.
(2) Can you please add the output of dev->ifindex in the pr_info() calls?

>From your first post I was able to read your current kernel as:
> $ uname -a
> Linux vpc3 3.10-3-rt-amd64 #1 SMP PREEMPT RT Debian 3.10.11-1
> (2013-09-10) x86_64 GNU/Linux

(3) Is it possible to use a standard (non-RT) kernel on your system to confirm
this issue on a unmodified system?

On 08.11.2013 00:43, Austin Schuh wrote:

> I added some pr_info prints at the front of sja1000_rx and
> sja1000_interrupt.  For each packet sent and then received, I see the
> following.  The following lines are from me sending 4 packets.
> 
> Nov  7 15:35:52 vpc5 kernel: [   75.136107] Got an sja1000 interrupt.
(which interface?)

> Nov  7 15:35:52 vpc5 kernel: [   75.136123] Unhandled IRQ 18... stop tracing...
> Nov  7 15:35:52 vpc5 kernel: [   75.136130] Got an sja1000 interrupt.
(which interface?)

> Nov  7 15:35:52 vpc5 kernel: [   75.136139] Received packet.
(which interface?)

> Nov  7 15:35:52 vpc5 kernel: [   75.136146] sja1000_rx
(which interface?)

> Nov  7 15:35:52 vpc5 kernel: [   75.136155] TX complete.
(which interface?)

> Nov  7 15:35:52 vpc5 kernel: [   75.136174] Returning IRQ_HANDLED
> Nov  7 15:35:52 vpc5 kernel: [   75.136207] Returning IRQ_HANDLED
(which interface?)

Thanks,
Oliver