linux-kernel - [PATCH v1 05/11] thermal/acpi: Optimize get_trip

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>] [day] [month] [year] [list]

Message-Id: <20230203173331.3322089-6-daniel.lezcano@linaro.org>
Date:   Fri,  3 Feb 2023 18:33:25 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     rjw@...ysocki.net
Cc:     linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, Len Brown <lenb@...nel.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v1 05/11] thermal/acpi: Optimize get_trip_points()

The function has two purposes. Initialize the trip points by reading
the ACPI table and then doing a check trip points exists.

This check will go through all the trip points and at the end if a
valid trip point is found, the parsing is considered valid.

Instead of checking all the trip points, exit when a valid trip point
is found.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/acpi/thermal.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 903f0e3d95f5..c4fd583fbf5c 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -461,23 +461,20 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 
 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 {
-	int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
+	int i, ret;
 
+	ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 	if (ret)
 		return ret;
 
-	valid = tz->trips[ACPI_THERMAL_TRIP_CRITICAL].flags.valid |
-		tz->trips[ACPI_THERMAL_TRIP_HOT].flags.valid |
-		tz->trips[ACPI_THERMAL_TRIP_PASSIVE].flags.valid;
+	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
+		if (tz->trips[i].flags.valid)
+			return 0;
+	}
 
-	for (i = ACPI_THERMAL_TRIP_ACTIVE; i < ACPI_THERMAL_MAX_ACTIVE; i++)
-		valid |= tz->trips[i].flags.valid;
+	pr_warn(FW_BUG "No valid trip found\n");
 
-	if (!valid) {
-		pr_warn(FW_BUG "No valid trip found\n");
-		return -ENODEV;
-	}
-	return 0;
+	return -ENODEV;
 }
 
 /* sys I/F for generic thermal sysfs support */
-- 
2.34.1