linux-kernel - Re: [PATCH] iio: magnetometer: ak8975: Fix 'Unexpected device' error

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Date:   Mon, 2 Oct 2023 12:55:16 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Biju Das <biju.das.jz@...renesas.com>
Cc:     Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        André Apitzsch <git@...tzsch.eu>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: magnetometer: ak8975: Fix 'Unexpected device' error

On Mon, Oct 02, 2023 at 09:38:17AM +0000, Biju Das wrote:
> > On Mon, Oct 02, 2023 at 10:27:45AM +0100, Jonathan Cameron wrote:
> > > On Sun, 1 Oct 2023 18:09:56 +0200
> > > André Apitzsch <git@...tzsch.eu> wrote:
> > 
> > > > Fixes: 4f9ea93afde1 ("iio: magnetometer: ak8975: Convert
> > > > enum->pointer for data in the match tables")
> > 
> > ^^^ (1)

...

> > > So we need the spacer until someone converts this driver to use
> > > pointers instead for both of and ACPI tables.
> > 
> > Isn't it done by (1) which is in your tree?
> 
> How (1) can trigger 'Unexpected device' error??
> It returns match_data, and match_data has correct device type.

How? The enum starts from 0 with a AKXXXX and ak_def_array starts from 0
indexing, it's classical off-by-one, you got the driver data for a wrong chip.

-- 
With Best Regards,
Andy Shevchenko