lkml.org 
[lkml]   [2008]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: nobody cared about IRQ 19 (firewire, on a HP 2510p notebook)
Martin Michlmayr wrote:
> I just got the following in dmesg a few minutes after booting my
> notebook which was idle at the time this occurred. This was with
> 2.6.25-rc6 but I've seen the same with 2.6.22 (see the attached
> dmesg from 2.6.22).
>
> irq 19: nobody cared (try booting with the "irqpoll" option)
> Pid: 0, comm: swapper Not tainted 2.6.25-rc6-amd64 #1
>
> Call Trace:
> <IRQ> [<ffffffff80271c0b>] __report_bad_irq+0x38/0x7c
> [<ffffffff80271e51>] note_interrupt+0x202/0x249
> [<ffffffff8027274e>] handle_fasteoi_irq+0xab/0xd0
> [<ffffffff8020f82c>] do_IRQ+0x6e/0xda
> [<ffffffff8020c65d>] ret_from_intr+0x0/0x19
> <EOI> [<ffffffff80221831>] ? native_irq_enable+0x6/0x7
> [<ffffffff88006330>] ? :processor:acpi_idle_enter_bm+0x2ab/0x325
> [<ffffffff803b5ef3>] ? menu_select+0x70/0x99
> [<ffffffff803b52e1>] ? cpuidle_idle_call+0x77/0xa6
> [<ffffffff803b526a>] ? cpuidle_idle_call+0x0/0xa6
> [<ffffffff8020b187>] ? cpu_idle+0xb1/0xdb
> [<ffffffff8042ea16>] ? rest_init+0x5a/0x5c
>
> handlers:
> [<ffffffff8806f0f5>] (irq_handler+0x0/0x207 [firewire_ohci])
> Disabling IRQ #19
...
> 02:06.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 04)
...

According to your 2.6.22 dmesg, this happens a while after the firewire
subsystem seemingly successfully initialized the controller. Could you
please post "dmesg | grep firewire" from 2.6.25-rc6 though?

The __report_bad_irq() and "Disabling IRQ #..." can only have happened
because this condition in fw-ohci.c::irq_handler()

event = reg_read(ohci, OHCI1394_IntEventClear);

if (!event || !~event)
return IRQ_NONE;

happened a lot of times. This means either
- Some MMIO reads return bogus values (all zero or all ones in a
bitfield which should be sparsely populated in a proper interrupt
event),
or
- the interrupt was misrouted by the kernel's IRQ infrastructure was
unable to detect the misrouting, AFAIU.
--
Stefan Richter
-=====-==--- --== =-=-=
http://arcgraph.de/sr/


\
 
 \ /
  Last update: 2008-03-21 17:33    [W:0.070 / U:1.348 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site