[lkml]   [2011]   [Mar]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH 0/6] get rid of on-stack dma buffers
    2011/3/22 Roedel, Joerg <>:
    > 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.

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2011-03-22 15:29    [W:0.019 / U:7.784 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site