hwmon: (lm95234) Rely on subsystem locking

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 <[e-mail]>

drivers/hwmon/lm95234.c

···
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/slab.h>
-#include <linux/mutex.h>
 #include <linux/regmap.h>
 #include <linux/util_macros.h>
 
···
 /* Client data (each client gets its own) */
 struct lm95234_data {
 	struct regmap *regmap;
-	struct mutex update_lock;
 	enum chips type;
 };
 
···
 	u32 tcrit;
 	int ret;
 
-	mutex_lock(&data->update_lock);
-
 	ret = regmap_read(data->regmap, LM95234_REG_TCRIT1(0), &tcrit);
 	if (ret)
-		goto unlock;
+		return ret;
 
 	val = DIV_ROUND_CLOSEST(clamp_val(val, -255000, 255000), 1000);
 	val = clamp_val((int)tcrit - val, 0, 31);
 
-	ret = regmap_write(data->regmap, LM95234_REG_TCRIT_HYST, val);
-unlock:
-	mutex_unlock(&data->update_lock);
-	return ret;
+	return regmap_write(data->regmap, LM95234_REG_TCRIT_HYST, val);
 }
 
 static int lm95234_crit_reg(int channel)
···
 		return PTR_ERR(regmap);
 
 	data->regmap = regmap;
-	mutex_init(&data->update_lock);
 
 	/* Initialize the LM95234 chip */
 	err = lm95234_init_client(dev, regmap);