Re: spi_finalize_current_transfer()?

[Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>]

On Mon, Jan 13, 2014 at 1:25 PM, Geert Uytterhoeven
<geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org> wrote:
> include/linux/spi/spi.h says:
>
>  * @transfer_one: transfer a single spi_transfer. When the
>  *                driver is finished with this transfer it must call
>  *                spi_finalize_current_transfer() so the subsystem can issue
>  *                the next transfer
>
> However, none of the current drivers implementing transfer_on() calls
> spi_finalize_current_transfer() (which just does
> "complete(&master->xfer_completion)").
> They also don't kick master->xfer_completion theirselves, they all have
> their own private xfer_completion.
>
> What am I missing?

Found it: spi_transfer_one_message() only waits for master->xfer_completion
if master->transfer_one() returned a strict-positive value. Which none of the
current drivers do.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org

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                                -- Linus Torvalds
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