linux-kernel - [PATCH v2 2/4] thermal/of: Return -ENODEV instead of -EINVAL if registration fails

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Message-Id: <20220809085629.509116-2-daniel.lezcano@linaro.org>
Date:   Tue,  9 Aug 2022 10:56:27 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     daniel.lezcano@...aro.org, rafael@...nel.org
Cc:     michael@...le.cc, dan.carpenter@...cle.com, linux@...ck-us.net,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>
Subject: [PATCH v2 2/4] thermal/of: Return -ENODEV instead of -EINVAL if registration fails

The previous version of the OF code was returning -ENODEV if no
thermal zones description was found or if the lookup of the sensor in
the thermal zones was not found.

The backend drivers are expecting this return value as an information
about skipping the sensor initialization and considered as normal.

Fix the return value by replacing -EINVAL by -ENODEV and remove the
error message as this missing is not considered as an error.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Tested-by: Michael Walle <michael@...le.cc>
---
  v2:
   - Change the error message to a debug message
   - Only show an error if the error is not -ENODEV
---
 drivers/thermal/thermal_of.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 368eb58e97cf..3effc729be4b 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -328,8 +328,8 @@ static struct device_node *of_thermal_zone_find(struct device_node *sensor, int
 
 	np = of_find_node_by_name(NULL, "thermal-zones");
 	if (!np) {
-		pr_err("Unable to find thermal zones description\n");
-		return ERR_PTR(-EINVAL);
+		pr_debug("No thermal zones description\n");
+		return ERR_PTR(-ENODEV);
 	}
 
 	/*
@@ -368,7 +368,7 @@ static struct device_node *of_thermal_zone_find(struct device_node *sensor, int
 			}
 		}
 	}
-	tz = ERR_PTR(-EINVAL);
+	tz = ERR_PTR(-ENODEV);
 out:
 	of_node_put(np);
 	return tz;
@@ -642,7 +642,8 @@ struct thermal_zone_device *thermal_of_zone_register(struct device_node *sensor,
 
 	np = of_thermal_zone_find(sensor, id);
 	if (IS_ERR(np)) {
-		pr_err("Failed to find thermal zone for %pOFn id=%d\n", sensor, id);
+		if (PTR_ERR(np) != -ENODEV)
+			pr_err("Failed to find thermal zone for %pOFn id=%d\n", sensor, id);
 		return ERR_CAST(np);
 	}
 
-- 
2.34.1