Commit 94e183fd authored by Jean Delvare's avatar Jean Delvare Committed by Jean Delvare
Browse files

hwmon/smsc47m1: Get rid of a useless mutex 



The smsc47m1 driver uses a mutex to protect the accesses to the
hardware registers. It really doesn't need any protection, as the
register space is flat. Get rid of that mutex for a smaller and
faster driver.

Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 8eccbb6f

drivers/hwmon/smsc47m1.c

+10 −23
Original line number Diff line number Diff line
@@ -116,7 +116,6 @@ struct smsc47m1_data { 
	struct i2c_client client;

	enum chips type;

	struct class_device *class_dev;

	struct mutex lock;



	struct mutex update_lock;

	unsigned long last_updated;	/* In jiffies */
@@ -131,13 +130,19 @@ struct smsc47m1_data { 


static int smsc47m1_detect(struct i2c_adapter *adapter);

static int smsc47m1_detach_client(struct i2c_client *client);



static int smsc47m1_read_value(struct i2c_client *client, u8 reg);

static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value);



static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,

		int init);



static inline int smsc47m1_read_value(struct i2c_client *client, u8 reg)

{

	return inb_p(client->addr + reg);

}



static inline void smsc47m1_write_value(struct i2c_client *client, u8 reg,

		u8 value)

{

	outb_p(value, client->addr + reg);

}



static struct i2c_driver smsc47m1_driver = {

	.driver = {
@@ -477,7 +482,6 @@ static int smsc47m1_detect(struct i2c_adapter *adapter) 
	new_client = &data->client;

	i2c_set_clientdata(new_client, data);

	new_client->addr = address;

	mutex_init(&data->lock);

	new_client->adapter = adapter;

	new_client->driver = &smsc47m1_driver;

	new_client->flags = 0;
@@ -633,23 +637,6 @@ static int smsc47m1_detach_client(struct i2c_client *client) 
	return 0;

}



static int smsc47m1_read_value(struct i2c_client *client, u8 reg)

{

	int res;



	mutex_lock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);

	res = inb_p(client->addr + reg);

	mutex_unlock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);

	return res;

}



static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value)

{

	mutex_lock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);

	outb_p(value, client->addr + reg);

	mutex_unlock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);

}



static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,

		int init)

{