linux-kernel - [PATCH v3 2/9] thermal: gov_power_allocator: Refactor check_power

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Message-Id: <20231220231753.1824364-3-lukasz.luba@arm.com>
Date: Wed, 20 Dec 2023 23:17:46 +0000
From: Lukasz Luba <lukasz.luba@....com>
To: linux-kernel@...r.kernel.org,
	rafael@...nel.org
Cc: linux-pm@...r.kernel.org,
	daniel.lezcano@...aro.org,
	rui.zhang@...el.com,
	lukasz.luba@....com
Subject: [PATCH v3 2/9] thermal: gov_power_allocator: Refactor check_power_actors()

In preparation for a subsequent change, rearrange check_power_actors().

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..d9175d9f5e3f 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.
+ * If all of the cooling devices currently attached to @tz implement the power
+ * actor API, return the number of them (which may be 0, because some cooling
+ * devices may be attached later). Otherwise, return -EINVAL.
  */
 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