[RFC/RFT] b43: Relax requirement for descriptors to be in the DMA zone

Larry Finger
2011-08-25T17:29:50Z

On 08/25/2011 12:24 PM, Rafa? Mi?ecki wrote:
> 2011/8/25 Larry Finger<Larry.Finger@lwfinger.net>:
>> When 64-bit DMA was first used, there were problems with the
>> BCM4311 (14e4:4311). The problem was "fixed" by using the GFP_DMA
>> flag in the allocation of coherent ring descriptor memory.
>>
>> The original problem is now believed to have been due to bugs in
>> the 64-bit DMA implementation in the rest of the kernel, and that
>> those bugs have been fixed. Accordingly, the requirement for the
>> descriptors to be in the DMA zone is relaxed.
>
> Larry, it is not clear to me from the commit message: did you test
> that patch with your 14e4:4311?

Yes.

Larry