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On Wed, Apr 26, 2006 at 10:08:33AM +0200, Filka Michal wrote:
>=20
> > > Hi all,
> > > I have a problem (possibly) with DMA. I can allocate a DMA memory in
> my
> > > driver and work with it without any troubles. However, If I unload
> > > driver (it is a LKM) and try to load it again, kernel crashes during
> DMA
> > > memory allocation. I did a DMA deinitialization when unloading
> driver
> >=20
> > How does it crash ?
>=20
> ... it breaks into kernel debugger (Page fault trap) during the call of
> "bus_dmamem_alloc". I made a simple skeleton of my driver which is only
> loaded and unloaded and it still fails in second attempt for loading it.
> First attempt loads/unloads without any troubles. All this happens even
> if I do only "..._alloc" and "..._free" with no other operations on
> DMAed memory.
>=20
> Any ideas are very welcome.

I'm afraid you'll have to show some code to get welcomed ideas...

--=20
Quentin Garnier - cube@cubidou.net - cube@NetBSD.org
"When I find the controls, I'll go where I like, I'll know where I want
to be, but maybe for now I'll stay right here on a silent sea."
KT Tunstall, Silent Sea, Eye to the Telescope, 2004.

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