linux-kernel - Re: [PATCH 3/3] ARM: sunxi: spi: use proper errno when message is too long.

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Message-ID: <20150426125421.GH5627@lukather>
Date:	Sun, 26 Apr 2015 14:54:21 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	linux-sunxi <linux-sunxi@...glegroups.com>,
	Mark Brown <broonie@...nel.org>,
	linux-spi <linux-spi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] ARM: sunxi: spi: use proper errno when message is
 too long.

On Sun, Apr 26, 2015 at 01:42:51PM +0200, Michal Suchanek wrote:
> On 26 April 2015 at 10:42, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > On Sat, Apr 25, 2015 at 09:21:07PM +0200, Michal Suchanek wrote:
> >> Signed-off-by: Michal Suchanek <hramrach@...il.com>
> >
> > No commit log?
> >
> >> ---
> >>  drivers/spi/spi-sun4i.c | 2 +-
> >>  drivers/spi/spi-sun6i.c | 2 +-
> >>  2 files changed, 2 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c
> >> index fbb0a4d..8238b4e 100644
> >> --- a/drivers/spi/spi-sun4i.c
> >> +++ b/drivers/spi/spi-sun4i.c
> >> @@ -176,7 +176,7 @@ static int sun4i_spi_transfer_one(struct spi_master *master,
> >>
> >>       /* We don't support transfer larger than the FIFO */
> >>       if (tfr->len > SUN4I_FIFO_DEPTH)
> >> -             return -EINVAL;
> >> +             return -EMSGSIZE;
> >
> > Is it still a thing? The patch to remove such limit hasn't been merged
> > yet?
> 
> Yes, seems so unless the patches are queued somewhere but not merged yet.
> 
> >
> >>       reinit_completion(&sspi->done);
> >>       sspi->tx_buf = tfr->tx_buf;
> >> diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c
> >> index ac48f59..0f5dd91 100644
> >> --- a/drivers/spi/spi-sun6i.c
> >> +++ b/drivers/spi/spi-sun6i.c
> >> @@ -166,7 +166,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master,
> >>
> >>       /* We don't support transfer larger than the FIFO */
> >>       if (tfr->len > SUN6I_FIFO_DEPTH)
> >> -             return -EINVAL;
> >> +             return -EMSGSIZE;
> >
> > Eventually, we should move to using DMA for these messages longer than
> > the FIFO.
> >
> > I should post these patches.
> >
> 
> Do you have those in a branch somewhere?

Not in a good shape, or at least, in a shape that have any chance to
be merged.

At the time I tried, I couldn't make the generic DMA work, so I had to
bypass that for my tests.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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