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: Jean Delvare <khali@linux-fr.org>

diff --git a/drivers/hwmon/smsc47m1.c b/drivers/hwmon/smsc47m1.c
index 16762cca87e54a04e42a88424a415ba86d08bda6..f219d7c6a98270ab074487e53326f8c47a5632b1 100644 (file)
--- a/drivers/hwmon/smsc47m1.c
+++ b/drivers/hwmon/smsc47m1.c
@@ -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)
 {