Regression in qca99x0 on x86 platform (kernel: 4.7.0-rc1-wt-ath

Rajkumar Manoharan rmanohar at
Tue Jun 14 19:55:34 PDT 2016

On 2016-06-14 19:14, Ben Greear wrote:
> On 06/13/2016 11:21 PM, Rajkumar Manoharan wrote:
>> On 2016-06-02 23:22, Ben Greear wrote:
>>> At the time, I bisected to this commit as well, but I decided to just
>>> live with it
>>> since it seemed it fixed some other bug and we had a work-around.  My
>>> understanding
>>> is that without the patch above, some ARM systems failed to work.
>> Ben,
>> I posted a fix for the freeze issue 
>> ( Can you please give a 
>> try with VT-d disabled?
>> -Rajkumar
> Yes, but it might be a bit.  I just ported my patches to 4.7, and will 
> add yours
> there.  We are mainly focussed on getting a stable 4.4+ out the door
> currently though.

> Were you able to test on the ARM platform that originally had the 
> problem that
> Felix's patch was supposed to fix?
I tested this patch on ARM platform. Unfortunately I did not observe 
original dma_alloc_coherent failures. Felix replaced dma_alloc_coherent 
by kmalloc + dma_map_single. I retained the logic as it is. Thee change 
is that host memory chuck size for target is limited by 256 KiB.


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