linux-kernel - Re: [PATCH v1 7/7] ACPI: property: Allow counting a single value as an array of 1 element

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Date:   Thu, 11 Feb 2021 17:42:18 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Len Brown <lenb@...nel.org>,
        Calvin Johnson <calvin.johnson@....nxp.com>
Subject: Re: [PATCH v1 7/7] ACPI: property: Allow counting a single value as
 an array of 1 element

On Wed, Feb 10, 2021 at 04:44:34PM +0100, Rafael J. Wysocki wrote:
> On Wed, Feb 10, 2021 at 4:42 PM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> > On Wed, Feb 10, 2021 at 04:01:16PM +0100, Rafael J. Wysocki wrote:
> > > On Wed, Feb 10, 2021 at 3:48 PM Andy Shevchenko
> > > <andriy.shevchenko@...ux.intel.com> wrote:
> > > > On Wed, Feb 10, 2021 at 02:48:09PM +0100, Rafael J. Wysocki wrote:
> > > > > On Wednesday, February 10, 2021 2:31:48 PM CET Rafael J. Wysocki wrote:
> > > > > > On Wednesday, February 10, 2021 1:36:00 PM CET Rafael J. Wysocki wrote:
> > > > > > > On Wed, Feb 10, 2021 at 12:51 PM Andy Shevchenko
> > > > > > > <andriy.shevchenko@...ux.intel.com> wrote:

...

> > > > > > > > -       if (val && nval == 1) {
> > > > > > > > +       /* Try to read as a single value first */
> > > > > > > > +       if (!val || nval == 1) {
> > > > > > > >                 ret = acpi_data_prop_read_single(data, propname, proptype, val);
> > > > > > >
> > > > > > > This returns -EINVAL if val is NULL.
> > > >
> > > > Nope. That's why it's a patch 7. Patch 6 solves this.
> > >
> > > That's my point.  Patch 7 should be the first one in the series.
> >
> > Ah, okay. Since you want this let me rebase.
> 
> Thanks!

I started rebasing and realised that your approach has swapped the error codes,
i.e. if it's a single-value and it is, e.g., 16-bit wide, the u8 read will
return 1, while it has to return -EOVERFLOW.

If you prefer, I can move two patches to the beginning, so one will be a good
prerequisite for this fix. And I'm still unsure about stable (Fixes tag is okay
to me), because the counting never worked from the day 1.

-- 
With Best Regards,
Andy Shevchenko