On Sat, 2007-05-12 at 19:05 +0900, FUJITA Tomonori wrote:
> Add a set of accessors for the scsi data buffer. This is in
> preparation for chaining sg lists and bidirectional requests (and
> possibly, the mid-layer dma mapping).
>
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
> ---
> drivers/scsi/scsi_lib.c | 26 ++++++++++++++++++++++++++
> include/scsi/scsi_cmnd.h | 11 +++++++++++
> 2 files changed, 37 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index 1f5a07b..a2ebe61 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -2290,3 +2290,29 @@ void scsi_kunmap_atomic_sg(void *virt)
> kunmap_atomic(virt, KM_BIO_SRC_IRQ);
> }
> EXPORT_SYMBOL(scsi_kunmap_atomic_sg);
> +
> +int scsi_dma_map(struct device *dev, struct scsi_cmnd *cmd)
Actually, this is redundant. We make sure the
shost->shost_gendev.parent is the device which should have been passed
in to scsi_add_host().
> +{
> + int nseg = 0;
> +
> + if (cmd->use_sg) {
> + struct scatterlist *sg =
> + (struct scatterlist *) cmd->request_buffer;
> +
> + nseg = dma_map_sg(dev, sg, cmd->use_sg, cmd->sc_data_direction);
> + if (unlikely(!nseg))
> + return -ENOMEM;
> + }
> + return nseg;
> +}
> +EXPORT_SYMBOL(scsi_dma_map);
> +
> +void scsi_dma_unmap(struct device *dev, struct scsi_cmnd *cmd)
Same here.
James
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