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    SubjectRe: [PATCH 0/6] get rid of on-stack dma buffers
    From
    2011/3/22 Roedel, Joerg <Joerg.Roedel@amd.com>:
    > On Mon, Mar 21, 2011 at 05:03:15PM -0400, Florian Mickler wrote:
    >> I guess (not verified), that the dma api takes sufficient precautions
    >> to abort the dma transfer if a timeout happens.  So freeing _should_
    >> not be an issue. (At least, I would expect big fat warnings everywhere
    >> if that were the case)
    >
    > Freeing is very well an issue. All you can expect from the DMA-API is to
    > give you a valid DMA handle for your device. But it can not prevent that
    > a device uses this handle after you returned it. You need to make sure
    > yourself that any pending DMA is canceled before calling kfree().

    sorry, I meant usb_control_msg above when I said 'dma api'... as that
    is the function these
    drivers use to do the dma.

    Regards,
    Flo
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