linux-kernel - [PATCH v2 2/8] thermal: gov_power_allocator: Refactor check_power

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Message-Id: <20231212134844.1213381-3-lukasz.luba@arm.com>
Date:   Tue, 12 Dec 2023 13:48:38 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     linux-kernel@...r.kernel.org, daniel.lezcano@...aro.org,
        rafael@...nel.org
Cc:     linux-pm@...r.kernel.org, rui.zhang@...el.com, lukasz.luba@....com
Subject: [PATCH v2 2/8] thermal: gov_power_allocator: Refactor check_power_actors()

Refactor check_power_actors() to make it possible for re-use in the
upcoming new callback.

No intentional functional impact.

Signed-off-by: Lukasz Luba <lukasz.luba@....com>
---
 drivers/thermal/gov_power_allocator.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/thermal/gov_power_allocator.c b/drivers/thermal/gov_power_allocator.c
index 785fff14223d..38e1e89ba10c 100644
--- a/drivers/thermal/gov_power_allocator.c
+++ b/drivers/thermal/gov_power_allocator.c
@@ -581,8 +581,9 @@ static void allow_maximum_power(struct thermal_zone_device *tz, bool update)
  * power actor API. The warning should help to investigate the issue, which
  * could be e.g. lack of Energy Model for a given device.
  *
- * Return: 0 on success, -EINVAL if any cooling device does not implement
- * the power actor API.
+ * Return number of cooling devices or -EINVAL if any cooling device does not
+ * implement the power actor API. Return value 0 is also valid since cooling
+ * devices might be attached later.
  */
 static int check_power_actors(struct thermal_zone_device *tz,
 			      struct power_allocator_params *params)
@@ -597,8 +598,9 @@ static int check_power_actors(struct thermal_zone_device *tz,
 		if (!cdev_is_power_actor(instance->cdev)) {
 			dev_warn(&tz->device, "power_allocator: %s is not a power actor\n",
 				 instance->cdev->type);
-			ret = -EINVAL;
+			return -EINVAL;
 		}
+		ret++;
 	}
 
 	return ret;
@@ -631,7 +633,7 @@ static int power_allocator_bind(struct thermal_zone_device *tz)
 	}
 
 	ret = check_power_actors(tz, params);
-	if (ret) {
+	if (ret < 0) {
 		dev_warn(&tz->device, "power_allocator: binding failed\n");
 		kfree(params);
 		return ret;
-- 
2.25.1