2010/9/17 Patriarche, Herve <herve.patriarche@xxxxxxxxxxxxx>:
> Hi,
>
> I confirmed this is due to dma_free_coherent after an xfer transfer complete.
> Do you know if this is fixed in a release after 2.6.27 ?
No, there is still the warning even for the latest 2.6.36-rc4.
>>-----Original Message-----
>>From: Patriarche, Herve
>>Sent: Friday, September 17, 2010 10:11 AM
>>To: Ming Lei
>>Cc: linux-usb
>>Subject: RE: USB: free coherent buffer into atomic context
>>
>>Hi Lei Ming,
>>
>>I confirmed, HCD_LOCAL_MEM flag is on.
>>I sometimes get a reset before the WARN so perhaps it is the
>>root cause, I will check.
I don't think the warning may be the root cause for the reset.
The warning only means dma_free_coherent is called with irq disabled.
It is not very difficult to fix the warning in usb hcd, but I need to know why
the WARN_ON below is added into dma_free_coherent.
WARN_ON(irqs_disabled());
Anyone know the reason?
--
Lei Ming
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