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    SubjectRe: [PATCH 0/3] Add API for weak DMA masks
    On Thursday 01 May 2008 17:43:58 Christoph Hellwig wrote:
    > On Thu, May 01, 2008 at 05:42:04PM +0200, Michael Buesch wrote:
    > > Yeah. because it has to be done in every driver.
    > > So we put the implementation into a central place, instead of
    > > reimplementing the wheel over and over again. This way we avoid bugs,
    > > like the "b43 broken on VIA boards" in the first place.
    > > Currently every driver requesting a >32bit mask and not retrying with
    > > a lower mask is broken on VIA hardware. I dunno how many of the current
    > > drivers that are, but everybody can easily see that is not a b43-specific
    > > problem that we should solve for b43 only.
    > Yeah. Personally I'd rather let set_dma_mask fall back silently,

    We've discussed that and this behaviour is not acceptable, as the driver
    must know about a possible fallback in case it can do 32bit DMA
    more efficiently than 64bit DMA, for example.

    So here we go. People rejected that approach, that I also suggested.
    Here's what people want.

    Greetings Michael.

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