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Date:   Tue, 14 Apr 2020 20:00:59 +0200
From:   Andrzej Pietrasiewicz <andrzej.p@...labora.com>
To:     linux-pm@...r.kernel.org
Cc:     Zhang Rui <rui.zhang@...el.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        "David S . Miller" <davem@...emloft.net>,
        Peter Kaestle <peter@...e.net>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Support Opensource <support.opensource@...semi.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amit.kucheria@...durent.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Allison Randal <allison@...utok.net>,
        Enrico Weigelt <info@...ux.net>,
        Gayatri Kammela <gayatri.kammela@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-acpi@...r.kernel.org, netdev@...r.kernel.org,
        platform-driver-x86@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kernel@...labora.com,
        Andrzej Pietrasiewicz <andrzej.p@...labora.com>
Subject: [RFC v2 3/9] thermal: Properly handle mode values in .set_mode()

Allow only THERMAL_DEVICE_ENABLED and THERMAL_DEVICE_DISABLED as valid
states to transition to.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@...labora.com>
---
 drivers/net/ethernet/mellanox/mlxsw/core_thermal.c | 8 ++++++--
 drivers/platform/x86/acerhdf.c                     | 4 ++++
 drivers/thermal/imx_thermal.c                      | 4 +++-
 drivers/thermal/intel/intel_quark_dts_thermal.c    | 5 ++++-
 drivers/thermal/of-thermal.c                       | 4 +++-
 5 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
index ce0a6837daa3..cd435ca7adbe 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
@@ -296,8 +296,10 @@ static int mlxsw_thermal_set_mode(struct thermal_zone_device *tzdev,
 
 	if (mode == THERMAL_DEVICE_ENABLED)
 		tzdev->polling_delay = thermal->polling_delay;
-	else
+	else if (mode == THERMAL_DEVICE_DISABLED)
 		tzdev->polling_delay = 0;
+	else
+		return -EINVAL;
 
 	mutex_unlock(&tzdev->lock);
 
@@ -486,8 +488,10 @@ static int mlxsw_thermal_module_mode_set(struct thermal_zone_device *tzdev,
 
 	if (mode == THERMAL_DEVICE_ENABLED)
 		tzdev->polling_delay = thermal->polling_delay;
-	else
+	else if (mode == THERMAL_DEVICE_DISABLED)
 		tzdev->polling_delay = 0;
+	else
+		return -EINVAL;
 
 	mutex_unlock(&tzdev->lock);
 
diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
index 8cc86f4e3ac1..d5188c1d688b 100644
--- a/drivers/platform/x86/acerhdf.c
+++ b/drivers/platform/x86/acerhdf.c
@@ -431,6 +431,10 @@ static int acerhdf_get_mode(struct thermal_zone_device *thermal,
 static int acerhdf_set_mode(struct thermal_zone_device *thermal,
 			    enum thermal_device_mode mode)
 {
+	if (mode != THERMAL_DEVICE_DISABLED &&
+	    mode != THERMAL_DEVICE_ENABLED)
+		return -EINVAL;
+
 	if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
 		acerhdf_revert_to_bios_mode();
 	else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index e761c9b42217..36b1924f1938 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -361,7 +361,7 @@ static int imx_set_mode(struct thermal_zone_device *tz,
 			data->irq_enabled = true;
 			enable_irq(data->irq);
 		}
-	} else {
+	} else if (mode == THERMAL_DEVICE_DISABLED) {
 		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
 			     soc_data->measure_temp_mask);
 		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
@@ -374,6 +374,8 @@ static int imx_set_mode(struct thermal_zone_device *tz,
 			disable_irq(data->irq);
 			data->irq_enabled = false;
 		}
+	} else {
+		return -EINVAL;
 	}
 
 	data->mode = mode;
diff --git a/drivers/thermal/intel/intel_quark_dts_thermal.c b/drivers/thermal/intel/intel_quark_dts_thermal.c
index d704fc104cfd..11d7db895125 100644
--- a/drivers/thermal/intel/intel_quark_dts_thermal.c
+++ b/drivers/thermal/intel/intel_quark_dts_thermal.c
@@ -325,8 +325,11 @@ static int sys_set_mode(struct thermal_zone_device *tzd,
 	mutex_lock(&dts_update_mutex);
 	if (mode == THERMAL_DEVICE_ENABLED)
 		ret = soc_dts_enable(tzd);
-	else
+	else if (mode == THERMAL_DEVICE_DISABLED)
 		ret = soc_dts_disable(tzd);
+	else
+		return -EINVAL;
+
 	mutex_unlock(&dts_update_mutex);
 
 	return ret;
diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index 874a47d6923f..36bebf623980 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -289,9 +289,11 @@ static int of_thermal_set_mode(struct thermal_zone_device *tz,
 	if (mode == THERMAL_DEVICE_ENABLED) {
 		tz->polling_delay = data->polling_delay;
 		tz->passive_delay = data->passive_delay;
-	} else {
+	} else if (mode == THERMAL_DEVICE_DISABLED) {
 		tz->polling_delay = 0;
 		tz->passive_delay = 0;
+	} else {
+		return -EINVAL;
 	}
 
 	mutex_unlock(&tz->lock);
-- 
2.17.1

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