linux-kernel - Re: [PATCH] ACPI: PCI: Fix device reference counting in acpi_get_pci

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Message-ID: <20221019165326.GA23726@bhelgaas>
Date:   Wed, 19 Oct 2022 11:53:26 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] ACPI: PCI: Fix device reference counting in
 acpi_get_pci_dev()

On Wed, Oct 19, 2022 at 11:54:42AM +0300, Ville Syrjälä wrote:
> On Tue, Oct 18, 2022 at 07:34:03PM +0200, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > 
> > Commit 63f534b8bad9 ("ACPI: PCI: Rework acpi_get_pci_dev()") failed
> > to reference count the device returned by acpi_get_pci_dev() as
> > expected by its callers which in some cases may cause device objects
> > to be dropped prematurely.
> > 
> > Add the missing get_device() to acpi_get_pci_dev().
> > 
> > Fixes: 63f534b8bad9 ("ACPI: PCI: Rework acpi_get_pci_dev()")
> 
> FYI this (and the rtc-cmos regression discussed in
> https://lore.kernel.org/linux-acpi/5887691.lOV4Wx5bFT@kreacher/)
> took down the entire Intel gfx CI.

>From 1000 miles away and zero background with the gfx CI, this sounds
like "our CI system, whose purpose is to find bugs, found one", which
is a good thing.

Bjorn