Difference b/w xfer_len and len fields

[Pratik Singhal]

What do you mean by "driver-internal" variables ?

On Sat, May 30, 2015 at 7:15 PM, Ian Lepore <ian at freebsd.org> wrote:

> On Sat, 2015-05-30 at 11:26 +0530, Pratik Singhal wrote:
> > What is the difference b/w the xfer_len and the len fields in the struct
> > mmc_data in file sys/dev/mmc/mmcreg.h  ?
> >
> > AFAIK , len is the length of the data present in mmc_data , what is
> > xfer_len ?
> >
>
> The xfer_len field has historically been unused, until recently.  When
> the dwc mmc driver was added, it uses xfer_len as a driver-internal
> variable to track how much of the overal work is done as the IO
> proceeds.
>
> -- Ian
>
>


-- 
Regards,
Pratik Singhal