[PATCH 03/20] hwmon: (adm9240) Rely on subsystem locking

[Guenter Roeck <linux@roeck-us.net>]

Attribute access is now serialized in the hardware monitoring core,
so locking in the driver code is no longer necessary. Drop it.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/hwmon/adm9240.c | 17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/drivers/hwmon/adm9240.c b/drivers/hwmon/adm9240.c
index 6dfbeb6acf00..86f6044b5bd0 100644
--- a/drivers/hwmon/adm9240.c
+++ b/drivers/hwmon/adm9240.c
@@ -37,7 +37,6 @@
 #include <linux/hwmon.h>
 #include <linux/hwmon-vid.h>
 #include <linux/err.h>
-#include <linux/mutex.h>
 #include <linux/regmap.h>
 
 /* Addresses to scan */
@@ -125,7 +124,6 @@ static inline unsigned int AOUT_FROM_REG(u8 reg)
 struct adm9240_data {
 	struct device *dev;
 	struct regmap *regmap;
-	struct mutex update_lock;
 
 	u8 fan_div[2];		/* rw	fan1_div, read-only accessor */
 	u8 vrm;			/* --	vrm set on startup, no accessor */
@@ -170,8 +168,6 @@ static int adm9240_fan_min_write(struct adm9240_data *data, int channel, long va
 	u8 fan_min;
 	int err;
 
-	mutex_lock(&data->update_lock);
-
 	if (!val) {
 		fan_min = 255;
 		new_div = data->fan_div[channel];
@@ -206,8 +202,6 @@ static int adm9240_fan_min_write(struct adm9240_data *data, int channel, long va
 	}
 	err = regmap_write(data->regmap, ADM9240_REG_FAN_MIN(channel), fan_min);
 
-	mutex_unlock(&data->update_lock);
-
 	return err;
 }
 
@@ -501,23 +495,17 @@ static int adm9240_fan_read(struct device *dev, u32 attr, int channel, long *val
 
 	switch (attr) {
 	case hwmon_fan_input:
-		mutex_lock(&data->update_lock);
 		err = regmap_read(data->regmap, ADM9240_REG_FAN(channel), &regval);
-		if (err < 0) {
-			mutex_unlock(&data->update_lock);
+		if (err < 0)
 			return err;
-		}
 		if (regval == 255 && data->fan_div[channel] < 3) {
 			/* adjust fan clock divider on overflow */
 			err = adm9240_write_fan_div(data, channel,
 						    ++data->fan_div[channel]);
-			if (err) {
-				mutex_unlock(&data->update_lock);
+			if (err)
 				return err;
-			}
 		}
 		*val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
-		mutex_unlock(&data->update_lock);
 		break;
 	case hwmon_fan_div:
 		*val = BIT(data->fan_div[channel]);
@@ -791,7 +779,6 @@ static int adm9240_probe(struct i2c_client *client)
 		return -ENOMEM;
 
 	data->dev = dev;
-	mutex_init(&data->update_lock);
 	data->regmap = devm_regmap_init_i2c(client, &adm9240_regmap_config);
 	if (IS_ERR(data->regmap))
 		return PTR_ERR(data->regmap);
-- 
2.45.2