From: Oliver Hartkopp <socketcan@hartkopp.net>
To: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: Wolfgang Grandegger <wg@grandegger.com>,
Austin Schuh <austin@peloton-tech.com>,
Pavel Pisa <pisa@cmp.felk.cvut.cz>,
linux-can@vger.kernel.org
Subject: Re: sja1000 interrupt problem
Date: Fri, 13 Dec 2013 17:22:50 +0100 [thread overview]
Message-ID: <52AB345A.6020203@hartkopp.net> (raw)
In-Reply-To: <52AADC61.6010807@pengutronix.de>
On 13.12.2013 11:07, Marc Kleine-Budde wrote:
> On 12/13/2013 10:38 AM, Oliver Hartkopp wrote:
>> +#if 0
>> u16 icr;
>>
>> /* Select and clear in PITA stored interrupt */
>> icr = readw(chan->cfg_base + PITA_ICR);
>> if (icr & chan->icr_mask)
>> writew(chan->icr_mask, chan->cfg_base + PITA_ICR);
>> +#else
>> + while (readw(chan->cfg_base + PITA_ICR) & chan->icr_mask)
>> + writew(chan->icr_mask, chan->cfg_base + PITA_ICR);
>> +#endif
>>
>> This should usually not have any effect, right?
>> But what happened was a big crash after a pretty short time:
>>
>> [ 760.718091] INFO: rcu_preempt self-detected stall on CPU { 1} (t=84015 jiffies g=482 c=481 q=2688)
>
> For me it seems that the new while loop keeps spinning and then the rcu
> subsystem detects some stalls.
>
> Maybe it's time to get in touch with the hardware engineers at peak.
>
I personally do not expect this to be a PEAK problem as the usual case with
mainline Linux (non -rt) works fine.
Maybe it's time to look into other implementations than PEAK/mainline ...
If they all do it the same way I would assume it's a plain -rt irq thread issue.
Regards,
Oliver
next prev parent reply other threads:[~2013-12-13 16:22 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-08 0:47 sja1000 interrupt problem Austin Schuh
2013-10-08 6:32 ` Wolfgang Grandegger
2013-10-08 6:58 ` Oliver Hartkopp
2013-10-08 18:48 ` Austin Schuh
2013-10-08 19:44 ` Wolfgang Grandegger
2013-10-08 20:47 ` Austin Schuh
2013-10-09 6:21 ` Wolfgang Grandegger
2013-10-09 6:31 ` Wolfgang Grandegger
2013-10-09 6:47 ` Wolfgang Grandegger
[not found] ` <CANGgnMZpPGctUWGcg7Lp-QFPc7d6A5GeL9KQYnpeYMR8WukgdA@mail.gmail.com>
2013-11-07 8:15 ` Wolfgang Grandegger
2013-11-07 23:43 ` Austin Schuh
2013-11-09 14:21 ` Oliver Hartkopp
2013-11-12 2:59 ` Austin Schuh
2013-11-12 21:26 ` Oliver Hartkopp
2013-11-12 23:22 ` Austin Schuh
2013-11-13 3:41 ` Austin Schuh
2013-11-13 6:58 ` Oliver Hartkopp
2013-11-13 9:48 ` Kurt Van Dijck
2013-11-13 6:44 ` Oliver Hartkopp
2013-11-13 8:11 ` Wolfgang Grandegger
2013-11-13 9:08 ` Pavel Pisa
2013-11-13 9:52 ` Wolfgang Grandegger
2013-11-13 18:41 ` Oliver Hartkopp
2013-11-13 19:29 ` Wolfgang Grandegger
2013-11-13 22:00 ` Oliver Hartkopp
2013-11-13 11:02 ` Kurt Van Dijck
2013-11-16 21:42 ` Oliver Hartkopp
2013-11-17 8:18 ` Wolfgang Grandegger
2013-11-17 14:27 ` Oliver Hartkopp
2013-11-17 17:23 ` Wolfgang Grandegger
2013-11-17 20:46 ` Wolfgang Grandegger
2013-11-18 17:08 ` Austin Schuh
2013-12-09 21:54 ` Austin Schuh
2013-12-09 21:54 ` Austin Schuh
2013-12-10 7:49 ` Wolfgang Grandegger
2013-12-10 8:05 ` Austin Schuh
2013-12-10 9:32 ` Wolfgang Grandegger
2013-12-10 13:47 ` Oliver Hartkopp
2013-12-10 14:23 ` Oliver Hartkopp
2013-12-10 14:41 ` Wolfgang Grandegger
2013-12-10 16:05 ` Oliver Hartkopp
2013-12-10 21:12 ` Wolfgang Grandegger
2013-12-11 16:59 ` Oliver Hartkopp
2013-12-11 19:27 ` Wolfgang Grandegger
2013-12-12 6:13 ` Oliver Hartkopp
2013-12-12 17:38 ` Oliver Hartkopp
2013-12-12 22:56 ` Wolfgang Grandegger
2013-12-13 0:07 ` Austin Schuh
2013-12-13 16:16 ` Oliver Hartkopp
2013-12-13 9:38 ` Oliver Hartkopp
2013-12-13 10:04 ` Wolfgang Grandegger
2013-12-13 10:09 ` Wolfgang Grandegger
2013-12-13 16:25 ` Oliver Hartkopp
2013-12-13 17:33 ` Wolfgang Grandegger
2013-12-13 10:07 ` Marc Kleine-Budde
2013-12-13 16:22 ` Oliver Hartkopp [this message]
2013-12-13 17:14 ` Oliver Hartkopp
2013-12-13 21:14 ` Oliver Hartkopp
2013-12-14 9:51 ` Oliver Hartkopp
2013-12-20 23:13 ` Austin Schuh
2013-12-21 8:29 ` Wolfgang Grandegger
2013-12-21 13:12 ` Oliver Hartkopp
2013-12-21 12:55 ` Oliver Hartkopp
2013-12-23 15:58 ` Oliver Hartkopp
2013-11-09 19:42 ` Wolfgang Grandegger
[not found] ` <CANGgnMbb+VResUC6h+cK6Hfe5PLJx9R9ao6bMdJM2e5BPaDamw@mail.gmail.com>
2013-11-12 22:15 ` Wolfgang Grandegger
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