diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hwmon/f71805f.c | 22 | ||||
| -rw-r--r-- | drivers/hwmon/it87.c | 22 |
2 files changed, 11 insertions, 33 deletions
diff --git a/drivers/hwmon/f71805f.c b/drivers/hwmon/f71805f.c index a272cae8f60e..2fc537819388 100644 --- a/drivers/hwmon/f71805f.c +++ b/drivers/hwmon/f71805f.c @@ -146,7 +146,6 @@ superio_exit(int base) struct f71805f_data { unsigned short addr; const char *name; - struct mutex lock; struct class_device *class_dev; struct mutex update_lock; @@ -271,50 +270,42 @@ static inline u8 temp_to_reg(long val) * Device I/O access */ +/* Must be called with data->update_lock held, except during initialization */ static u8 f71805f_read8(struct f71805f_data *data, u8 reg) { - u8 val; - - mutex_lock(&data->lock); outb(reg, data->addr + ADDR_REG_OFFSET); - val = inb(data->addr + DATA_REG_OFFSET); - mutex_unlock(&data->lock); - - return val; + return inb(data->addr + DATA_REG_OFFSET); } +/* Must be called with data->update_lock held, except during initialization */ static void f71805f_write8(struct f71805f_data *data, u8 reg, u8 val) { - mutex_lock(&data->lock); outb(reg, data->addr + ADDR_REG_OFFSET); outb(val, data->addr + DATA_REG_OFFSET); - mutex_unlock(&data->lock); } /* It is important to read the MSB first, because doing so latches the - value of the LSB, so we are sure both bytes belong to the same value. */ + value of the LSB, so we are sure both bytes belong to the same value. + Must be called with data->update_lock held, except during initialization */ static u16 f71805f_read16(struct f71805f_data *data, u8 reg) { u16 val; - mutex_lock(&data->lock); outb(reg, data->addr + ADDR_REG_OFFSET); val = inb(data->addr + DATA_REG_OFFSET) << 8; outb(++reg, data->addr + ADDR_REG_OFFSET); val |= inb(data->addr + DATA_REG_OFFSET); - mutex_unlock(&data->lock); return val; } +/* Must be called with data->update_lock held, except during initialization */ static void f71805f_write16(struct f71805f_data *data, u8 reg, u16 val) { - mutex_lock(&data->lock); outb(reg, data->addr + ADDR_REG_OFFSET); outb(val >> 8, data->addr + DATA_REG_OFFSET); outb(++reg, data->addr + ADDR_REG_OFFSET); outb(val & 0xff, data->addr + DATA_REG_OFFSET); - mutex_unlock(&data->lock); } static struct f71805f_data *f71805f_update_device(struct device *dev) @@ -1150,7 +1141,6 @@ static int __devinit f71805f_probe(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_IO, 0); data->addr = res->start; - mutex_init(&data->lock); data->name = names[sio_data->kind]; mutex_init(&data->update_lock); diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c index bb16668ad2bd..18bb44d18e89 100644 --- a/drivers/hwmon/it87.c +++ b/drivers/hwmon/it87.c @@ -221,7 +221,6 @@ static const unsigned int pwm_freq[8] = { struct it87_data { struct i2c_client client; struct class_device *class_dev; - struct mutex lock; enum chips type; struct mutex update_lock; @@ -548,9 +547,10 @@ static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr, struct i2c_client *client = to_i2c_client(dev); struct it87_data *data = i2c_get_clientdata(client); int val = simple_strtol(buf, NULL, 10); - u8 reg = it87_read_value(client, IT87_REG_FAN_DIV); + u8 reg; mutex_lock(&data->update_lock); + reg = it87_read_value(client, IT87_REG_FAN_DIV); switch (nr) { case 0: data->fan_div[nr] = reg & 0x07; break; case 1: data->fan_div[nr] = (reg >> 3) & 0x07; break; @@ -949,7 +949,6 @@ static int it87_detect(struct i2c_adapter *adapter) } new_client = &data->client; - mutex_init(&data->lock); i2c_set_clientdata(new_client, data); new_client->addr = isa_address; new_client->adapter = adapter; @@ -1127,33 +1126,22 @@ static int it87_detach_client(struct i2c_client *client) return 0; } -/* ISA access must be locked explicitly! +/* Must be called with data->update_lock held, except during initialization. We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks, would slow down the IT87 access and should not be necessary. */ static int it87_read_value(struct i2c_client *client, u8 reg) { - struct it87_data *data = i2c_get_clientdata(client); - int res; - - mutex_lock(&data->lock); outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET); - res = inb_p(client->addr + IT87_DATA_REG_OFFSET); - mutex_unlock(&data->lock); - - return res; + return inb_p(client->addr + IT87_DATA_REG_OFFSET); } -/* ISA access must be locked explicitly! +/* Must be called with data->update_lock held, except during initialization. We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks, would slow down the IT87 access and should not be necessary. */ static void it87_write_value(struct i2c_client *client, u8 reg, u8 value) { - struct it87_data *data = i2c_get_clientdata(client); - - mutex_lock(&data->lock); outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET); outb_p(value, client->addr + IT87_DATA_REG_OFFSET); - mutex_unlock(&data->lock); } /* Return 1 if and only if the PWM interface is safe to use */ |