linux-kernel - [PATCH 6/6] platform/x86: wmi: Simplify get_subobj

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20231216015601.395118-7-W_Armin@gmx.de>
Date: Sat, 16 Dec 2023 02:56:01 +0100
From: Armin Wolf <W_Armin@....de>
To: hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com
Cc: platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 6/6] platform/x86: wmi: Simplify get_subobj_info()

All callers who call get_subobj_info() with **info being NULL
should better use acpi_has_method() instead.
Convert the only caller who does this to acpi_has_method()
to drop the dummy info handling.

Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/platform/x86/wmi.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 6b581c772fd1..73570744bc33 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -132,23 +132,19 @@ static const void *find_guid_context(struct wmi_block *wblock,
 static int get_subobj_info(acpi_handle handle, const char *pathname,
 			   struct acpi_device_info **info)
 {
-	struct acpi_device_info *dummy_info, **info_ptr;
 	acpi_handle subobj_handle;
 	acpi_status status;

-	status = acpi_get_handle(handle, (char *)pathname, &subobj_handle);
+	status = acpi_get_handle(handle, pathname, &subobj_handle);
 	if (status == AE_NOT_FOUND)
 		return -ENOENT;
-	else if (ACPI_FAILURE(status))
-		return -EIO;

-	info_ptr = info ? info : &dummy_info;
-	status = acpi_get_object_info(subobj_handle, info_ptr);
 	if (ACPI_FAILURE(status))
 		return -EIO;

-	if (!info)
-		kfree(dummy_info);
+	status = acpi_get_object_info(subobj_handle, info);
+	if (ACPI_FAILURE(status))
+		return -EIO;

 	return 0;
 }
@@ -998,9 +994,7 @@ static int wmi_create_device(struct device *wmi_bus_dev,
 	kfree(info);

 	get_acpi_method_name(wblock, 'S', method);
-	result = get_subobj_info(device->handle, method, NULL);
-
-	if (result == 0)
+	if (acpi_has_method(device->handle, method))
 		wblock->dev.setable = true;

  out_init:
--
2.39.2