Re: [PATCH 1/3] ACPI: Resolve objects on host-directed table loads

From: "Shevchenko, Andriy" <andriy.shevchenko@intel.com>
To: Nikolaus Voss <nv@vosn.de>
Cc: "Schmauss, Erik" <erik.schmauss@intel.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>,
	"Moore, Robert" <robert.moore@intel.com>,
	Jacek Anaszewski <jacek.anaszewski@gmail.com>,
	Pavel Machek <pavel@ucw.cz>, Dan Murphy <dmurphy@ti.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
	"devel@acpica.org" <devel@acpica.org>,
	"linux-leds@vger.kernel.org" <linux-leds@vger.kernel.org>,
	"linux-pwm@vger.kernel.org" <linux-pwm@vger.kernel.org>,
	nikolaus.voss@loewensteinmedical.de
Subject: Re: [PATCH 1/3] ACPI: Resolve objects on host-directed table loads
Date: Fri, 30 Aug 2019 17:53:48 +0300	[thread overview]
Message-ID: <20190830145348.GM2680@smile.fi.intel.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1908161345590.41303@fox.voss.local>

On Fri, Aug 16, 2019 at 01:57:26PM +0200, Nikolaus Voss wrote:
> On Wed, 14 Aug 2019, Schmauss, Erik wrote:
> > > -----Original Message-----
> > > From: Shevchenko, Andriy
> > > Sent: Wednesday, August 14, 2019 11:51 AM
> > > To: Nikolaus Voss <nikolaus.voss@loewensteinmedical.de>
> > > Cc: Rafael J. Wysocki <rjw@rjwysocki.net>; Len Brown <lenb@kernel.org>;
> > > Moore, Robert <robert.moore@intel.com>; Schmauss, Erik
> > > <erik.schmauss@intel.com>; Jacek Anaszewski <jacek.anaszewski@gmail.com>;
> > > Pavel Machek <pavel@ucw.cz>; Dan Murphy <dmurphy@ti.com>; Thierry
> > > Reding <thierry.reding@gmail.com>; linux-acpi@vger.kernel.org;
> > > devel@acpica.org; linux-leds@vger.kernel.org; linux-pwm@vger.kernel.org
> > > Subject: Re: [PATCH 1/3] ACPI: Resolve objects on host-directed table loads
> > > 
> > > On Wed, May 29, 2019 at 02:18:20PM +0200, Nikolaus Voss wrote:
> > > > If an ACPI SSDT overlay is loaded after built-in tables have been
> > > > loaded e.g. via configfs or efivar_ssdt_load() it is necessary to
> > > > rewalk the namespace to resolve references. Without this, relative and
> > > > absolute paths like ^PCI0.SBUS or \_SB.PCI0.SBUS are not resolved
> > > > correctly.
> > > > 
> > > > Make configfs load use the same method as efivar_ssdt_load().
> > > 
> > > This patch brought a regression (bisect log below).
> > > Now I'm unable to unload the table which was working before.
> > > 
> > > Reverting (manual, due to ACPICA changes) helps.
> > > 
> > > Please, consider to revert for this cycle, or fix. I will be glad to test any
> > > proposed fix.
> > 
> > We submitted a patch (d1fb5b2f623b1af5a0d2a83d205df1b61f430dc6)
> > in response to this suggestion and I was not aware that this had been applied.
> > 
> > Rafael, please revert at least the ACPICA portion of this patch.
> 
> As I see it, my ACPICA change is not part of 5.3-rc1 any more. Reverting my
> fix is part of the patch above (d1fb5b2f623b1af5a0d2a83d205df1b61f430dc6)
> which is already applied.
> 
> Nevertheless, what is new, is that acpi_ns_initialize_objects() is called in
> acpi_load_table(). This is necessary to resolve the references in the newly
> loaded table. Maybe this prevents the table from being unloaded?

So, can we do something about it? It's a regression.

Rafael, Nikolaus?

-- 
With Best Regards,
Andy Shevchenko