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    SubjectRe: [PATCH 1/3] dmaengine: add new dma API for max_segment_number
    Hi Vinod,

    Thoughts?

    --
    Regards,
    Shawn

    On Thu, May 26, 2011 at 02:31:31PM +0800, Shawn Guo wrote:
    > Like dma_set(get)_max_seg_size for max_segment_size, the patch adds
    > max_segment_number into device_dma_parameters and creates the
    > corresponding dmaengine API dma_set(get)_max_seg_number for it.
    >
    > Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
    > ---
    > include/linux/device.h | 1 +
    > include/linux/dma-mapping.h | 15 +++++++++++++++
    > 2 files changed, 16 insertions(+), 0 deletions(-)
    >
    > diff --git a/include/linux/device.h b/include/linux/device.h
    > index c66111a..44cb2528 100644
    > --- a/include/linux/device.h
    > +++ b/include/linux/device.h
    > @@ -487,6 +487,7 @@ struct device_dma_parameters {
    > * sg limitations.
    > */
    > unsigned int max_segment_size;
    > + unsigned int max_segment_number;
    > unsigned long segment_boundary_mask;
    > };
    >
    > diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
    > index ba8319a..fd314f4 100644
    > --- a/include/linux/dma-mapping.h
    > +++ b/include/linux/dma-mapping.h
    > @@ -131,6 +131,21 @@ static inline unsigned int dma_set_max_seg_size(struct device *dev,
    > return -EIO;
    > }
    >
    > +static inline unsigned int dma_get_max_seg_number(struct device *dev)
    > +{
    > + return dev->dma_parms ? dev->dma_parms->max_segment_number : 1;
    > +}
    > +
    > +static inline unsigned int dma_set_max_seg_number(struct device *dev,
    > + unsigned int number)
    > +{
    > + if (dev->dma_parms) {
    > + dev->dma_parms->max_segment_number = number;
    > + return 0;
    > + } else
    > + return -EIO;
    > +}
    > +
    > static inline unsigned long dma_get_seg_boundary(struct device *dev)
    > {
    > return dev->dma_parms ?
    > --
    > 1.7.4.1



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