linux-kernel - Re: [PATCH v1 1/3] ACPI: video: Fix refcounting in apple_gmux_backlight

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Message-ID: <Y87PWaFFpHeW5YLv@smile.fi.intel.com>
Date:   Mon, 23 Jan 2023 20:18:01 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        acpica-devel@...ts.linuxfoundation.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Robert Moore <robert.moore@...el.com>
Subject: Re: [PATCH v1 1/3] ACPI: video: Fix refcounting in
 apple_gmux_backlight_present()

On Mon, Jan 23, 2023 at 06:46:44PM +0100, Hans de Goede wrote:
> On 1/23/23 18:10, Andy Shevchenko wrote:
> > acpi_dev_get_first_match_dev() gets ACPI device with the bumped
> > refcount. The caller must drop it when it's done.
> > 
> > Fix ACPI device refcounting in apple_gmux_backlight_present().

...

> Thank you for your work on this, much appreciated and I like
> the new acpi_get_first_match_physical_node().
> 
> But I don't think this patch is a good idea. There is a
> regression related to apple_gmux_backlight_present()
> with a patch-set fixing it pending.
> 
> And that patch-set actually removes this function. Adding
> a fix for this real, but not really important leak now,
> will just make backporting the actual fix harder.
> 
> So I would prefer for this patch to not go in and to
> go for (a to be submitted v2) of the patch-set fixing
> the regression right away instead.

Maybe I missed something, but I noticed that you actually moved (not killed)
the code which is currently in this function. If it's the case, I prefer my
fix to be imported first.

-- 
With Best Regards,
Andy Shevchenko