linux-kernel - Re: [PATCH v3 1/2] iio: addac: stx104: Migrate to the regmap API

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Message-ID: <ZCg1FyfcOvpLrMmH@fedora>
Date:   Sat, 1 Apr 2023 09:43:51 -0400
From:   William Breathitt Gray <william.gray@...aro.org>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] iio: addac: stx104: Migrate to the regmap API

On Sat, Apr 01, 2023 at 02:51:21PM +0100, Jonathan Cameron wrote:
> 
> > 
> > > +		do {
> > > +			err = regmap_read(priv->aio_ctl_map, STX104_ADC_STATUS, &adc_status);
> > > +			if (err)
> > > +				return err;
> > > +		} while (u8_get_bits(adc_status, STX104_CNV));  
> > 
> > Hmm... Isn't it a potential infinite loop (e.g., ther hardware / firmware
> > is broken)?
> > 
> > Why not using regmap_read_poll_timeout() (or its atomic variant, depends on
> > the case)?
> 
> Just to shortcut things as I'm looking at this.
> That's currently handled in patch 2.  Argument being this is a direct conversion
> of existing code, whereas changing to xxx_poll_timeout() is an improvement.
> 
> I'm fine with it just being rolled into first patch with a note in the patch
> description though if that works better.

I'm going to keep it as a separate follow-up patch because introducing a
timeout is enough of a functional change to risk a regression that
having it in a dedicated commit makes it easier to revert later if we
need to.

William Breathitt Gray

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