Re: iwlwifi warn_slowpath with 3.*

[Antonio Quartulli <ordex@autistici.org>]

[-- Attachment #1: Type: text/plain, Size: 1215 bytes --]

On Tue, May 01, 2012 at 04:52:23PM +0000, Venkataraman, Meenakshi wrote:
> Hi John, Antonio,
> 
> Emmanuel found a race condition in rx buffer allocation/deallocation, and attached is a patch that fixes it.
> 
> >> > since linux-3.0 (I don't remember if it was the case even before),
> >> > I'm getting this output in dmesg:
> >> >
> >> > [   53.662990] ------------[ cut here ]------------
> >> > [   53.663016] WARNING: at drivers/iommu/intel-iommu.c:2911
> >> > intel_unmap_page+0x14b/0x180()
> >> > [   53.663047] Hardware name: Latitude E5420
> >> > [   53.663066] Driver unmaps unmatched page at PFN ffd1a000
> >>
> >>
> >> I see that I always get the same addr passed to the unmap function:
> >>
> >> [   23.950535] Driver unmaps unmatched page at PFN ffd1a000
> >>
> >> is it a coincidence?
> >> I'm running linux-3.3.3 right now. I can try wireless-testing if it would help.
> 
> [MV] Antonio -- can you try out the patch attached and let us know if you continue to see the problem?

Ok, I will first try with a plain wireless-testing kernel and then I will apply
the patch.

Thanks!



-- 
Antonio Quartulli

..each of us alone is worth nothing..
Ernesto "Che" Guevara

[-- Attachment #2: Type: application/pgp-signature, Size: 490 bytes --]