BUG() in lbs_host_to_card_done()

[Manuel Stahl]

Am 11.03.2010 23:27, schrieb Dan Williams:
> On Wed, 2010-03-10 at 11:04 +0000, Jonathan Cameron wrote:
>> On 03/10/10 08:33, Manuel Stahl wrote:
>>> I got a kernel oops after loading, unloading and reloading the libertas
>>> driver. It can be reproduced every time. It's worth to note that the
>>> firmware loaded successful the first time, but then there were command
>>> timeouts. The crash on the second load happened before loading the
>>> firmware. Here is the stack trace:
>> Hi Manuel,
>>
>> Not entirely sure what you have here, but last time I checked it wasn't
>> possible to restart this driver as no one could get the card to reset
>> from software (there are people doing it by cutting the power) and there
>> was no easy way of finding out if the firmware was already running..
>
> Right; nothing standard  method could find to do will reset the card via
> software when it's in a wedged state or even to re-initialize it when
> the driver is loaded.  The only apparent alternatives are out-of-band
> mechanisms using GPIOs to toggle the card's power, or perhaps your SDIO
> controller has some mechanism to shoot the card in the head.
>
>> Still, shouldn't get a NULL dereference anyway!
>
> Yeah, that's certainly a bug.  Any chance the reporter could try a newer
> driver than 2.6.28?  There have been one or two fixes since 2.6.28 that
> might have an impact, but no obvious fix.

Actually it's a 2.6.32.9 kernel.

> Dan
>
>> Jonathan
>>>
>>> libertas_sdio: Libertas SDIO driver
>>> libertas_sdio: Copyright Pierre Ossman
>>> libertas_sdio mmc0:0001:1: firmware: requesting sd8686_helper.bin
>>> Unable to handle kernel NULL pointer dereference at virtual address
>>> 00000ac8
>>> pgd = c0004000
>>> [00000ac8] *pgd=00000000
>>> Internal error: Oops: 17 [#1]
>>> last sysfs file:
>>> /sys/devices/platform/at91_mci/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/firmware/mmc0:0001:1/loading
>>> Modules linked in: libertas_sdio(+) libertas [last unloaded: libertas_sdio]
>>> CPU: 0    Not tainted  (2.6.32.3 #104)
>>> PC is at lbs_host_to_card_done+0x6c/0x118 [libertas]
>>> LR is at if_sdio_interrupt+0x104/0x990 [libertas_sdio]
>>> pc : [<bf00074c>]    lr : [<bf03a698>]    psr: 80000093
>>> sp : c156bf34  ip : c156bf4c  fp : c156bf48
>>> r10: c153ca00  r9 : 7fffffff  r8 : c153ca00
>>> r7 : c15e0000  r6 : c153c600  r5 : 00000000  r4 : 80000013
>>> r3 : 80000093  r2 : 00000001  r1 : c1623800  r0 : 00000000
>>> Flags: Nzcv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
>>> Control: c000717f  Table: 21578000  DAC: 00000017
>>> Process ksdioirqd/mmc0 (pid: 3341, stack limit = 0xc156a260)
>>> Stack: (0xc156bf34 to 0xc156c000)
>>> bf20:                                              00000003 00000001
>>> c156bf7c
>>> bf40: c156bf4c bf03a698 bf0006f0 00000000 c156bef4 00000000 00000000
>>> 00000001
>>> bf60: c153c600 00000000 c153ca00 c153ca00 c156bfc4 c156bf80 c04287f8
>>> bf03a5a4
>>> bf80: 00000000 c156bf9b c153c768 00000002 c156a000 00000001 0256a000
>>> c156bfcc
>>> bfa0: c154fd80 c153c600 c04286e8 00000000 00000000 00000000 c156bff4
>>> c156bfc8
>>> bfc0: c0337328 c04286f8 00000000 00000000 c156bfd0 c156bfd0 00000000
>>> 00000000
>>> bfe0: 00000000 00000000 00000000 c156bff8 c0326898 c03372b4 00000000
>>> 00000000
>>> Backtrace:
>>> [<bf0006e0>] (lbs_host_to_card_done+0x0/0x118 [libertas]) from
>>> [<bf03a698>] (if_sdio_interrupt+0x104/0x990 [libertas_sdio])
>>>   r5:00000001 r4:00000003
>>> [<bf03a594>] (if_sdio_interrupt+0x0/0x990 [libertas_sdio]) from
>>> [<c04287f8>] (sdio_irq_thread+0x110/0x24c)
>>> [<c04286e8>] (sdio_irq_thread+0x0/0x24c) from [<c0337328>]
>>> (kthread+0x84/0x8c)
>>> [<c03372a4>] (kthread+0x0/0x8c) from [<c0326898>] (do_exit+0x0/0x590)
>>>   r7:00000000 r6:00000000 r5:00000000 r4:00000000
>>> Code: eb521dc6 e10f4000 e3843080 e121f003 (e5953ac8)
>>> ---[ end trace 1424f0fa36430ab1 ]---
>>
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>
>
>
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-- 
Dipl.-Inf. Manuel Stahl
Fraunhofer-Institut für Integrierte Schaltungen IIS
- Leistungsoptimierte Systeme -
Nordostpark 93                Telefon  +49 (0)911/58061-6419
90411 Nürnberg                Fax      +49 (0)911/58061-6398
http://www.iis.fraunhofer.de  manuel.stahl at iis.fraunhofer.de
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