hwmon: (ltc4245) 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.

While at it, drop the unnecessary include of hwmon-sysfs.h.

Signed-off-by: Guenter Roeck <[e-mail]>

drivers/hwmon/ltc4245.c

···
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/hwmon.h>
-#include <linux/hwmon-sysfs.h>
 #include <linux/jiffies.h>
 #include <linux/platform_data/ltc4245.h>
 
···
 struct ltc4245_data {
 	struct i2c_client *client;
 
-	struct mutex update_lock;
 	bool valid;
 	unsigned long last_updated; /* in jiffies */
 
···
 	s32 val;
 	int i;
 
-	mutex_lock(&data->update_lock);
-
 	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
-
 		/* Read control registers -- 0x00 to 0x07 */
 		for (i = 0; i < ARRAY_SIZE(data->cregs); i++) {
 			val = i2c_smbus_read_byte_data(client, i);
···
 		data->last_updated = jiffies;
 		data->valid = true;
 	}
-
-	mutex_unlock(&data->update_lock);
 
 	return data;
 }
···
 		return -ENOMEM;
 
 	data->client = client;
-	mutex_init(&data->update_lock);
 	data->use_extra_gpios = ltc4245_use_extra_gpios(client);
 
 	/* Initialize the LTC4245 chip */