linux-kernel - Re: [PATCH v3] ASoC: cs43130: Allow driver to work without IRQ connection

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Date:   Mon, 20 Nov 2023 15:54:14 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Maciej Strozek <mstrozek@...nsource.cirrus.com>
Cc:     James Schulman <james.schulman@...rus.com>,
        David Rhodes <david.rhodes@...rus.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        alsa-devel@...a-project.org, patches@...nsource.cirrus.com,
        linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] ASoC: cs43130: Allow driver to work without IRQ
 connection

On Mon, Nov 20, 2023 at 03:46:26PM +0000, Maciej Strozek wrote:
> W dniu 20/11/2023 o 14:40, Mark Brown pisze:

> > > +		} else {
> > > +			return 0;
> > > +		}

> > Is it a bug to call this function without to_poll set to something
> > known?  This will just silently ignore it which seems wrong and is
> > inconsitent with the handling in the interrupt case which will wait for
> > the the completion to be signalled and report a timeout on error.

> In interrupt case 0 means timeout (and calling function should expect 0 as
> error/timeout), so the only inconsistency I see is in not waiting before
> returning a timeout, but that would be needlessly wasting time?
> Do you think adding a debug print or a comment would help here?

It seems like a clear code bug if this is ever called with an unknown
completion, I'd expect a WARN_ON_ONCE() there.  The lack of a delay is
potentially going to affect how any error handling works which doesn't
feel ideal though the users look fine right now.

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