linux-kernel - Re: [PATCH AUTOSEL 5.4 137/350] iio: pressure: zpa2326: fix iio_triggered_buffer

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Date:   Mon, 16 Dec 2019 07:50:32 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "sashal@...nel.org" <sashal@...nel.org>,
        "jic23@...23.retrosnub.co.uk" <jic23@...23.retrosnub.co.uk>
CC:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "Jonathan.Cameron@...wei.com" <Jonathan.Cameron@...wei.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: Re: [PATCH AUTOSEL 5.4 137/350] iio: pressure: zpa2326: fix
 iio_triggered_buffer_postenable position

On Sun, 2019-12-15 at 15:57 +0000, Jonathan Cameron wrote:
> [External]
> 
> On Tue, 10 Dec 2019 16:04:02 -0500
> Sasha Levin <sashal@...nel.org> wrote:
> 
> > From: Alexandru Ardelean <alexandru.ardelean@...log.com>
> > 
> > [ Upstream commit fe2392c67db9730d46f11fc4fadfa7bffa8843fa ]
> > 
> > The iio_triggered_buffer_{predisable,postenable} functions
> > attach/detach
> > the poll functions.
> > 
> > The iio_triggered_buffer_postenable() should be called before (to
> > attach
> > the poll func) and then the
> > 
> > The iio_triggered_buffer_predisable() function is hooked directly
> > without
> > anything, which is probably fine, as the postenable() version seems to
> > also
> > do some reset/wake-up of the device.
> > This will mean it will be easier when removing it; i.e. it just gets
> > removed.
> 
> Ah. I should have added a note to this one as well.  This is more general
> rework, that is a fix in the sense of bringing things towards a standard
> way of doing things rather than 'fixing' a known bug.
> 
> Alex, for any more of these, lets not have fix in the title (though they
> sort of do 'fix' things).
> 

Ack.
I don't think there are many drivers left though.
But will keep this in mind.

Thanks
Alex


> Thanks,
> 
> Jonathan
> 
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> > Signed-off-by: Sasha Levin <sashal@...nel.org>
> > ---
> >  drivers/iio/pressure/zpa2326.c | 16 +++++++++-------
> >  1 file changed, 9 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/iio/pressure/zpa2326.c
> > b/drivers/iio/pressure/zpa2326.c
> > index 9d0d07930236e..99dfe33ee402f 100644
> > --- a/drivers/iio/pressure/zpa2326.c
> > +++ b/drivers/iio/pressure/zpa2326.c
> > @@ -1243,6 +1243,11 @@ static int zpa2326_postenable_buffer(struct
> > iio_dev *indio_dev)
> >  	const struct zpa2326_private *priv = iio_priv(indio_dev);
> >  	int                           err;
> >  
> > +	/* Plug our own trigger event handler. */
> > +	err = iio_triggered_buffer_postenable(indio_dev);
> > +	if (err)
> > +		goto err;
> > +
> >  	if (!priv->waken) {
> >  		/*
> >  		 * We were already power supplied. Just clear hardware FIFO
> > to
> > @@ -1250,7 +1255,7 @@ static int zpa2326_postenable_buffer(struct
> > iio_dev *indio_dev)
> >  		 */
> >  		err = zpa2326_clear_fifo(indio_dev, 0);
> >  		if (err)
> > -			goto err;
> > +			goto err_buffer_predisable;
> >  	}
> >  
> >  	if (!iio_trigger_using_own(indio_dev) && priv->waken) {
> > @@ -1260,16 +1265,13 @@ static int zpa2326_postenable_buffer(struct
> > iio_dev *indio_dev)
> >  		 */
> >  		err = zpa2326_config_oneshot(indio_dev, priv->irq);
> >  		if (err)
> > -			goto err;
> > +			goto err_buffer_predisable;
> >  	}
> >  
> > -	/* Plug our own trigger event handler. */
> > -	err = iio_triggered_buffer_postenable(indio_dev);
> > -	if (err)
> > -		goto err;
> > -
> >  	return 0;
> >  
> > +err_buffer_predisable:
> > +	iio_triggered_buffer_predisable(indio_dev);
> >  err:
> >  	zpa2326_err(indio_dev, "failed to enable buffering (%d)", err);
> >