linux-kernel - [PATCH RFC 5/9] thermal/acpi: Optimize get_trip

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Date:   Tue,  4 Oct 2022 19:26:54 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     rafael@...nel.org
Cc:     linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
        Len Brown <lenb@...nel.org>
Subject: [PATCH RFC 5/9] 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 ce37494bd133..9841b597a9c7 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -463,23 +463,20 @@ 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