linux-kernel - [PATCH v1] thermal: Add some error messages

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Message-Id: <640cd0cd93e199459af6d6d04bad228e909faf54.1556305991.git.amit.kucheria@linaro.org>
Date:   Sat, 27 Apr 2019 00:45:15 +0530
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     linux-kernel@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     linux-pm@...r.kernel.org
Subject: [PATCH v1] thermal: Add some error messages

When registering a thermal zone device, we currently return -EINVAL in
four cases. This is makes is a little hard to debug the real cause of
the failure.

Print some error messages to make it easier for developer to figure out
what happened.

Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
---
 drivers/thermal/thermal_core.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 6590bb5cb688..51cb6d2bf7a2 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1189,17 +1189,26 @@ thermal_zone_device_register(const char *type, int trips, int mask,
 	int count;
 	struct thermal_governor *governor;
 
-	if (!type || strlen(type) == 0)
+	if (!type || strlen(type) == 0) {
+		pr_err("Error: No thermal zone type defined");
 		return ERR_PTR(-EINVAL);
+	}
 
-	if (type && strlen(type) >= THERMAL_NAME_LENGTH)
+	if (type && strlen(type) >= THERMAL_NAME_LENGTH) {
+		pr_err("Error: Thermal zone name (%s) too long, should be under %d chars",
+		       type, THERMAL_NAME_LENGTH);
 		return ERR_PTR(-EINVAL);
+	}
 
-	if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
+	if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) {
+		pr_err("Error: Incorrect number of thermal trips");
 		return ERR_PTR(-EINVAL);
+	}
 
-	if (!ops)
+	if (!ops) {
+		pr_err("Error: Thermal zone device ops not defined");
 		return ERR_PTR(-EINVAL);
+	}
 
 	if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
 		return ERR_PTR(-EINVAL);
-- 
2.17.1