linux-kernel - [PATCH 5/8] ACPI: platform_profile: Use guard(mutex) for register/unregister

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: <20241025193055.2235-6-mario.limonciello@amd.com>
Date: Fri, 25 Oct 2024 14:30:52 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Hans de Goede <hdegoede@...hat.com>, Ilpo Järvinen
	<ilpo.jarvinen@...ux.intel.com>
CC: "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
	Maximilian Luz <luzmaximilian@...il.com>, Lee Chun-Yi <jlee@...e.com>, "Shyam
 Sundar S K" <Shyam-sundar.S-k@....com>, Corentin Chary
	<corentin.chary@...il.com>, "Luke D . Jones" <luke@...nes.dev>, Ike Panhc
	<ike.pan@...onical.com>, Henrique de Moraes Holschuh <hmh@....eng.br>,
	"Alexis Belmonte" <alexbelm48@...il.com>, Uwe Kleine-König
	<u.kleine-koenig@...gutronix.de>, Ai Chao <aichao@...inos.cn>, Gergo Koteles
	<soyer@....hu>, open list <linux-kernel@...r.kernel.org>, "open list:ACPI"
	<linux-acpi@...r.kernel.org>, "open list:MICROSOFT SURFACE PLATFORM PROFILE
 DRIVER" <platform-driver-x86@...r.kernel.org>, "open list:THINKPAD ACPI
 EXTRAS DRIVER" <ibm-acpi-devel@...ts.sourceforge.net>, Mark Pearson
	<mpearson-lenovo@...ebb.ca>, Matthew Schwartz <matthew.schwartz@...ux.dev>,
	Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH 5/8] ACPI: platform_profile: Use guard(mutex) for register/unregister

guard(mutex) can be used to automatically release mutexes when going
out of scope.

Tested-by: Matthew Schwartz <matthew.schwartz@...ux.dev>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/acpi/platform_profile.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 0c60fc970b6e8..81928adccfade 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -180,41 +180,34 @@ int platform_profile_register(struct platform_profile_handler *pprof)
 {
 	int err;
 
-	mutex_lock(&profile_lock);
+	guard(mutex)(&profile_lock);
 	/* We can only have one active profile */
-	if (cur_profile) {
-		mutex_unlock(&profile_lock);
+	if (cur_profile)
 		return -EEXIST;
-	}
 
 	/* Sanity check the profile handler field are set */
 	if (!pprof || bitmap_empty(pprof->choices, PLATFORM_PROFILE_LAST) ||
-		!pprof->profile_set || !pprof->profile_get) {
-		mutex_unlock(&profile_lock);
+		!pprof->profile_set || !pprof->profile_get)
 		return -EINVAL;
-	}
 
 	err = sysfs_create_group(acpi_kobj, &platform_profile_group);
-	if (err) {
-		mutex_unlock(&profile_lock);
+	if (err)
 		return err;
-	}
 	list_add_tail(&pprof->list, &platform_profile_handler_list);
 
 	cur_profile = pprof;
-	mutex_unlock(&profile_lock);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(platform_profile_register);
 
 int platform_profile_remove(struct platform_profile_handler *pprof)
 {
+	guard(mutex)(&profile_lock);
+
 	list_del(&pprof->list);
 
 	sysfs_remove_group(acpi_kobj, &platform_profile_group);
-	mutex_lock(&profile_lock);
 	cur_profile = NULL;
-	mutex_unlock(&profile_lock);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(platform_profile_remove);
-- 
2.43.0