linux-kernel - [PATCH] ACPI: glue: Use acpi_device_adr() in acpi_find_child

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Date:   Wed, 27 Oct 2021 18:59:06 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH] ACPI: glue: Use acpi_device_adr() in acpi_find_child_device()

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

Instead of evaluating _ADR in acpi_find_child_device(), use the
observation that it has already been evaluated and the value returned
by it has been stored in the pnp.type.bus_address field of the ACPI
device object at hand.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

Note that the patch at

https://patchwork.kernel.org/project/linux-acpi/patch/2223516.ElGaqSPkdT@kreacher/

will have an effect of this, so I'm going to prioritize the current patch
over the one above.

---
 drivers/acpi/glue.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

Index: linux-pm/drivers/acpi/glue.c
===================================================================
--- linux-pm.orig/drivers/acpi/glue.c
+++ linux-pm/drivers/acpi/glue.c
@@ -113,13 +113,10 @@ struct acpi_device *acpi_find_child_devi
 		return NULL;
 
 	list_for_each_entry(adev, &parent->children, node) {
-		unsigned long long addr;
-		acpi_status status;
+		acpi_bus_address addr = acpi_device_adr(adev);
 		int score;
 
-		status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR,
-					       NULL, &addr);
-		if (ACPI_FAILURE(status) || addr != address)
+		if (!adev->pnp.type.bus_address || addr != address)
 			continue;
 
 		if (!ret) {