linux-kernel - [PATCH v1 2/2] ACPI: scan: Do not set type.bus_address if

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Date:   Tue, 26 Oct 2021 21:00:03 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH v1 2/2] ACPI: scan: Do not set type.bus_address if _HID is valid

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

According to Section 6.1 of ACPI 6.4, it is invalid to provide both
_HID and _ADR for one device at the same time, so modify the code to
set pnp.type.bus_address and pnp.bus_address for a device only if it
has _ADR, but it doesn't have a valid _HID.

Link: https://uefi.org/specs/ACPI/6.4/06_Device_Configuration/Device_Configuration.html#device-identification-objects
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/scan.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-pm/drivers/acpi/scan.c
===================================================================
--- linux-pm.orig/drivers/acpi/scan.c
+++ linux-pm/drivers/acpi/scan.c
@@ -1343,11 +1343,11 @@ static void acpi_set_pnp_ids(acpi_handle
 				for (i = 0; i < cid_list->count; i++)
 					acpi_add_id(pnp, cid_list->ids[i].string);
 			}
-		}
-		if (info->valid & ACPI_VALID_ADR) {
+		} else if (info->valid & ACPI_VALID_ADR) {
 			pnp->bus_address = info->address;
 			pnp->type.bus_address = 1;
 		}
+
 		if (info->valid & ACPI_VALID_UID)
 			pnp->unique_id = kstrdup(info->unique_id.string,
 							GFP_KERNEL);