Re: IrDA driver fails on PXA255

[Russell King - ARM Linux]

On Sat, May 28, 2011 at 04:34:07PM -0700, David Rientjes wrote:
> The driver is attempting to allocate DMA memory and you have 
> CONFIG_ZONE_DMA disabled, which is the only reason you would get this 
> warning.  If the allocation did not fail as a result of a197b59ae6e8, the 
> page allocator may return any memory in a higher zone that the driver may 
> not be expecting.  If you had never noticed a problem before, it may be 
> possible that the driver doesn't actually have any zone restrictions and 
> GFP_DMA can be removed, but this code is pretty old.  Otherwise, it'll 
> need to depend on ZONE_DMA in the Kconfig.
> 
> Let's cc Nicolas and Russell as well.

Ouch.  We're probably going to have a pile of work to do to check that
the DMA masks on all our devices are correct for the unrestricted case
then.  That's probably going to be a very _big_ patch.
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