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

Rafał Miłecki zajec5 at gmail.com
Thu Aug 25 14:08:35 EDT 2011

W dniu 25 sierpnia 2011 19:29 użytkownik Larry Finger
<Larry.Finger at lwfinger.net> napisał:
> On 08/25/2011 12:24 PM, Rafał Miłecki wrote:
>> 2011/8/25 Larry Finger<Larry.Finger at 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.

Great, thanks for taking a look at this :)


More information about the b43-dev mailing list