Re: Soft lockup when disconnecting musb isochronous device.

[Koen Kooi <k.kooi@xxxxxxxxxxxxxxxxxx>]

Op 30 sep 2008, om 08:03 heeft Gupta, Ajay Kumar het volgende  
geschreven:

> > I've been trying to get the UVC camera driver working in linux-omap  
> > on
> > the Beagleboard, which uses musb.  With the latest linux-omap git,
> > capture doesn't work.  Applying Ajay Gupta's MUSB patches posted here
> > on 9/8 allows capture to work until the device is closed.
> > With or without Ajay's patches, when the device is closed, the
> > following lockup occurs.  Let me know if there is anything I can do  
> > to
> > help debug this.
>
> Have you applied below patch posted on 25/08/2008?
> [PATCH v3] OMAP: MUSB: Corrects urb unlink function path
>
> This patch is accepted and is pending to be merged with latest OMAP  
> GIT.

That patch sadly doesn't fix this:

tune to: :482000:I999B8C999D999M999T999G999Y999:T:27500:
Unable to handle kernel NULL pointer dereference at virtual address  
00000000
pgd = c12f4000
[00000000] *pgd=86d52031, *pte=00000000, *ppte=00000000
Internal error: Oops: 817 [#1]
Modules linked in: mt2060 dvb_usb_dib0700 dib7000p dib7000m sn9c102  
dvb_usb videodev v4l1_compat dvb_core dib3000mc dibx000_common dib0070  
ipv6
CPU: 0    Not tainted  (2.6.27-rc7-omap1 #1)
PC is at dma_cache_maint+0x40/0xa4
LR is at usb_hcd_submit_urb+0x164/0x870
pc : [<c00386cc>]    lr : [<c01eae34>]    psr: 20000013
sp : c6f9bca0  ip : c6f9bcb0  fp : c6f9bcac
r10: c64a0828  r9 : 00000020  r8 : 00000000
r7 : 00000000  r6 : c78ec800  r5 : c64a0820  r4 : ffc46000
r3 : 00000000  r2 : 00000002  r1 : ffc4fa38  r0 : ffc46000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 00c5387f  Table: 812f4018  DAC: 00000015
Process w_scan (pid: 1755, stack limit = 0xc6f9a2e8)
Stack: (0xc6f9bca0 to 0xc6f9c000)
bca0: c6f9bd64 c6f9bcb0 c01eae34 c0038698 c00822fc c0080b60 00000044  
c6d53e40
bcc0: c6f9bd04 00000000 c0442ce4 00000000 00000000 00000001 00000000  
c6f9a000


it happens when w_scan tries to tune into a specific frequency on a  
USB DVB-T stick. Any ideas about that one?

I have applied these patches:

[PATCH v3] OMAP:MUSB: Corrects urb unlink function path
usb: musb: fix something
MUSB high-bandwidth support patch
MUSB ISO dma fix.

regards,

Koen



regards,

Koen

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