Re: [Em28xx] ehci_hcd map_single: unable to map unsafe buffer on a standard NSLU2

Thierry Merle a écrit :
> Thierry Merle a écrit :
>> Markus Rechberger a écrit :
>>  
>>> can you test the device with a normal PC too?
>>> this will give you an image how it should behave in a usual 
>>> environment..
>>>
>>> Markus
>>>
>>>       
>> Right, tested OK in the same configuration.
>> In fact the NSLU2 freezes only when a channel is tuned. I tried 
>> without plugging the antenna cable and scan did not freeze the 
>> kernel. All firmwares loaded OK.
>> I tried to solder the serial console but my bad soldering iron made a 
>> bad work. I stopped before breaking definitely the NSLU2.
>>
>>   
> OK I succeeded in making the serial console work and got the USB problem.
> I soldered a mobile phone data cable (containing a ark3116) on the 
> NSLU2 serial pinouts and it worked.
>
> Attached is the logs before the end. It is proven that this is a 
> memory allocation problem now...
> minicom has truncated the lines to 80 chars in a curious way but the 
> information is here.
> Thierry
>
Hello,
another bad news ;)
I tested today to lower the usb allocation in em2880-dvb.c
EM2880_DVB_NUM_PACKETS set to 8 instead of 64.
I have an infinite loop of messages on console as soon as scan starts 
and tries to tune a channel:
BUG: warning at arch/arm/mm/consistent.c:363/dma_free_coherent()
BUG: warning at arch/arm/mm/consistent.c:363/dma_free_coherent()
BUG: warning at arch/arm/mm/consistent.c:363/dma_free_coherent()
This warning is caused by: WARN_ON(irqs_disabled()); in dma_free_coherent.
The function comment says:  * Must not be called with IRQs disabled.

I think that I have no more the memory problem, but now this is a 
dma_free_coherent that is called in a place where IRQ are disabled (like 
a locked section or other? just a supposition).

Thierry

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