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SubjectRe: GFP_DMA not good enough for problem hardware
   Date: Mon, 18 Oct 1999 10:32:18 +0100
From: Giuliano Procida <>

> Note also that this makes such cards out of spec, PCI wise. Many
> PCI sound cards have these issues as well (most implement the lower
> 24 bits, and use the upper bits in their DMA descriptors for control
> information, supposedly to save logic gates in the hw or to simplify
> it in some other way).

I haven't found anything obvious under drivers/sound.

They all use GFP_DMA and assume this means that the PCI bus mastering
address used for such a physical page will also be below 16MB, much of
drivers/sound has portability quirks like this.

David S. Miller

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