linux-kernel - Re: [PATCH] staging: iio: ad7192: Use the dedicated reset function

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Message-ID: <20170916153300.7e2731af@archlinux>
Date:   Sat, 16 Sep 2017 15:33:00 -0700
From:   Jonathan Cameron <jic23@...23.retrosnub.co.uk>
To:     Michael Hennerich <michael.hennerich@...log.com>
Cc:     Stefan Popa <stefan.popa@...log.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Hartmut Knaack <knaack.h@....de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-iio@...r.kernel.org>, <devel@...verdev.osuosl.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: iio: ad7192: Use the dedicated reset function

On Sat, 16 Sep 2017 15:22:23 -0700
Jonathan Cameron <jic23@...nel.org> wrote:

> On Thu, 14 Sep 2017 16:31:06 +0200
> Michael Hennerich <michael.hennerich@...log.com> wrote:
> 
> > On 14.09.2017 15:50, Stefan Popa wrote:  
> > > SPI host drivers can use DMA to transfer data, so the buffer should be properly allocated.
> > > Keeping it on the stack could cause an undefined behavior.
> > > 
> > > The dedicated reset function solves this issue.
> > > 
> > > Signed-off-by: Stefan Popa <stefan.popa@...log.com>    
> > 
> > Acked-by: Michael Hennerich <michael.hennerich@...log.com>  
> 
> Applied to the togreg branch of iio.git rather than staging
> branch as the reset functionality is reasonably recent and
> not going to be available in stable kernels etc..
> 
> Good work. I was reading this on a plane the other day and
> noticed the same issue - always nice when someone else
> fixes something on your todo list ;)
> 
> Jonathan

Doh, I had forgotten the support was part of a fix for a different
driver so is only in the fixes-togreg branch of iio.git.

I'll take this one the same way with a bit of a tweak to the patch
title to make it clear it is fixing something.

Jonathan
> 
> > 
> > Well done!
> > 
> >   
> > > ---
> > >   drivers/staging/iio/adc/ad7192.c | 4 +---
> > >   1 file changed, 1 insertion(+), 3 deletions(-)
> > > 
> > > diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
> > > index d11c6de..6150d27 100644
> > > --- a/drivers/staging/iio/adc/ad7192.c
> > > +++ b/drivers/staging/iio/adc/ad7192.c
> > > @@ -223,11 +223,9 @@ static int ad7192_setup(struct ad7192_state *st,
> > >   	struct iio_dev *indio_dev = spi_get_drvdata(st->sd.spi);
> > >   	unsigned long long scale_uv;
> > >   	int i, ret, id;
> > > -	u8 ones[6];
> > >   
> > >   	/* reset the serial interface */
> > > -	memset(&ones, 0xFF, 6);
> > > -	ret = spi_write(st->sd.spi, &ones, 6);
> > > +	ret = ad_sd_reset(&st->sd, 48);
> > >   	if (ret < 0)
> > >   		goto out;
> > >   	usleep_range(500, 1000); /* Wait for at least 500us */
> > >     
> > 
> >   
> 
> --
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