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sony-laptop: add locking on accesses to the ioport and global vars

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Better avoid having ioport commands mixing and global variables reading/writing.

Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
malattia@linux.it 2007-04-28 23:19:36 +09:00 committed by Len Brown
parent 5f3d2898d7
commit 9f9f076171
1 changed files with 31 additions and 12 deletions
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43
drivers/misc/sony-laptop.c
View file

@ -928,6 +928,7 @@ struct sony_pic_dev {
struct sony_pic_ioport *cur_ioport;
struct list_head interrupts;
struct list_head ioports;
struct mutex lock;
};
static struct sony_pic_dev spic_dev = {
@ -1224,7 +1225,7 @@ static u8 sony_pic_call3(u8 dev, u8 fn, u8 v)
#define SONYPI_CAMERA_STATUS_READY 0x2
#define SONYPI_CAMERA_STATUS_POSITION 0x4
static int sony_pic_camera_ready(void)
static int __sony_pic_camera_ready(void)
{
u8 v;
@ -1239,6 +1240,7 @@ static int sony_pic_camera_off(void)
return -ENODEV;
}
mutex_lock(&spic_dev.lock);
wait_on_command(sony_pic_call3(0x90, SONYPI_CAMERA_PICTURE,
SONYPI_CAMERA_MUTE_MASK),
ITERATIONS_SHORT);
@ -1247,20 +1249,23 @@ static int sony_pic_camera_off(void)
sony_pic_call2(0x91, 0);
spic_dev.camera_power = 0;
}
mutex_unlock(&spic_dev.lock);
return 0;
}
static int sony_pic_camera_on(void)
{
int i, j, x;
int result = 0;
if (!camera) {
printk(KERN_WARNING DRV_PFX "camera control not enabled\n");
return -ENODEV;
}
mutex_lock(&spic_dev.lock);
if (spic_dev.camera_power)
return 0;
goto out_unlock;
for (j = 5; j > 0; j--) {
@ -1269,7 +1274,7 @@ static int sony_pic_camera_on(void)
sony_pic_call1(0x93);
for (i = 400; i > 0; i--) {
if (sony_pic_camera_ready())
if (__sony_pic_camera_ready())
break;
msleep(10);
}
@ -1279,7 +1284,8 @@ static int sony_pic_camera_on(void)
if (j == 0) {
printk(KERN_WARNING DRV_PFX "failed to power on camera\n");
return -ENODEV;
result = -ENODEV;
goto out_unlock;
}
wait_on_command(sony_pic_call3(0x90, SONYPI_CAMERA_CONTROL,
@ -1287,6 +1293,9 @@ static int sony_pic_camera_on(void)
ITERATIONS_SHORT);
spic_dev.camera_power = 1;
out_unlock:
mutex_unlock(&spic_dev.lock);
return 0;
}
@ -1314,11 +1323,15 @@ static ssize_t sony_pic_camerapower_store(struct device *dev,
static ssize_t sony_pic_camerapower_show(struct device *dev,
struct device_attribute *attr, char *buffer)
{
return snprintf(buffer, PAGE_SIZE, "%d\n", spic_dev.camera_power);
ssize_t count;
mutex_lock(&spic_dev.lock);
count = snprintf(buffer, PAGE_SIZE, "%d\n", spic_dev.camera_power);
mutex_unlock(&spic_dev.lock);
return count;
}
/* bluetooth subsystem power state */
static void sony_pic_set_bluetoothpower(u8 state)
static void __sony_pic_set_bluetoothpower(u8 state)
{
state = !!state;
if (spic_dev.bluetooth_power == state)
@ -1337,7 +1350,9 @@ static ssize_t sony_pic_bluetoothpower_store(struct device *dev,
return -EINVAL;
value = simple_strtoul(buffer, NULL, 10);
sony_pic_set_bluetoothpower(value);
mutex_lock(&spic_dev.lock);
__sony_pic_set_bluetoothpower(value);
mutex_unlock(&spic_dev.lock);
return count;
}
@ -1345,7 +1360,11 @@ static ssize_t sony_pic_bluetoothpower_store(struct device *dev,
static ssize_t sony_pic_bluetoothpower_show(struct device *dev,
struct device_attribute *attr, char *buffer)
{
return snprintf(buffer, PAGE_SIZE, "%d\n", spic_dev.bluetooth_power);
ssize_t count = 0;
mutex_lock(&spic_dev.lock);
count = snprintf(buffer, PAGE_SIZE, "%d\n", spic_dev.bluetooth_power);
mutex_unlock(&spic_dev.lock);
return count;
}
/* fan speed */
@ -1518,7 +1537,7 @@ static int sonypi_misc_ioctl(struct inode *ip, struct file *fp,
u16 val16;
int value;
/*down(&sonypi_device.lock);*/
mutex_lock(&spic_dev.lock);
switch (cmd) {
case SONYPI_IOCGBRT:
if (sony_backlight_device == NULL) {
@ -1602,7 +1621,7 @@ static int sonypi_misc_ioctl(struct inode *ip, struct file *fp,
ret = -EFAULT;
break;
}
sony_pic_set_bluetoothpower(val8);
__sony_pic_set_bluetoothpower(val8);
break;
/* FAN Controls */
case SONYPI_IOCGFAN:
@ -1633,7 +1652,7 @@ static int sonypi_misc_ioctl(struct inode *ip, struct file *fp,
default:
ret = -EINVAL;
}
/*up(&sonypi_device.lock);*/
mutex_unlock(&spic_dev.lock);
return ret;
}
@ -1673,7 +1692,6 @@ static int sonypi_compat_init(void)
}
init_waitqueue_head(&sonypi_compat.fifo_proc_list);
/*init_MUTEX(&sonypi_device.lock);*/
if (minor != -1)
sonypi_misc_device.minor = minor;
@ -2004,6 +2022,7 @@ static int sony_pic_add(struct acpi_device *device)
spic_dev.acpi_dev = device;
strcpy(acpi_device_class(device), "sony/hotkey");
spic_dev.model = sony_pic_detect_device_type();
mutex_init(&spic_dev.lock);
/* read _PRS resources */
result = sony_pic_possible_resources(device);