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

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Message-ID: <12097002.O9o76ZdvQC@kreacher>
Date:   Tue, 18 Oct 2022 19:34:03 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux PCI <linux-pci@...r.kernel.org>
Cc:     Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Helgaas <helgaas@...nel.org>
Subject: [PATCH] ACPI: PCI: Fix device reference counting in acpi_get_pci_dev()

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()")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/pci_root.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-pm/drivers/acpi/pci_root.c
===================================================================
--- linux-pm.orig/drivers/acpi/pci_root.c
+++ linux-pm/drivers/acpi/pci_root.c
@@ -323,6 +323,7 @@ struct pci_dev *acpi_get_pci_dev(acpi_ha
 
 	list_for_each_entry(pn, &adev->physical_node_list, node) {
 		if (dev_is_pci(pn->dev)) {
+			get_device(pn->dev);
 			pci_dev = to_pci_dev(pn->dev);
 			break;
 		}