Re: [PATCH] [3/22] Remove unchecked_isa_dma in advansys.c

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On Mon, Feb 25, 2008 at 03:50:22PM -0700, Matthew Wilcox wrote:
> On Mon, Feb 25, 2008 at 11:40:35PM +0100, Andi Kleen wrote:
> > > (I must have fixed it somehow because it works on parisc, which is most
> > > unforgiving of drivers which do DMA without the DMA API).
> > 
> > At least on x86 the DMA API cannot do ISA bouncing.
> 
> You're saying that if I set a 24-bit DMA mask, and then do a
> pci_alloc_coherent(), x86 might hand me back something that's not
> accessible?  That would be just broken.

No pci_alloc_coherent works, but pci_map_* will not.

-Andi
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