diff options
Diffstat (limited to 'drivers/hid/hidraw.c')
-rw-r--r-- | drivers/hid/hidraw.c | 34 |
1 files changed, 17 insertions, 17 deletions
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c index 79faac87a06f..681614a8302a 100644 --- a/drivers/hid/hidraw.c +++ b/drivers/hid/hidraw.c @@ -34,7 +34,7 @@ static int hidraw_major; static struct cdev hidraw_cdev; static struct class *hidraw_class; static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES]; -static DEFINE_MUTEX(minors_lock); +static DECLARE_RWSEM(minors_rwsem); static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) { @@ -107,7 +107,7 @@ static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, __u8 *buf; int ret = 0; - lockdep_assert_held(&minors_lock); + lockdep_assert_held(&minors_rwsem); if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { ret = -ENODEV; @@ -160,9 +160,9 @@ out: static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { ssize_t ret; - mutex_lock(&minors_lock); + down_read(&minors_rwsem); ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT); - mutex_unlock(&minors_lock); + up_read(&minors_rwsem); return ret; } @@ -182,7 +182,7 @@ static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t int ret = 0, len; unsigned char report_number; - lockdep_assert_held(&minors_lock); + lockdep_assert_held(&minors_rwsem); if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { ret = -ENODEV; @@ -272,7 +272,7 @@ static int hidraw_open(struct inode *inode, struct file *file) goto out; } - mutex_lock(&minors_lock); + down_read(&minors_rwsem); if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { err = -ENODEV; goto out_unlock; @@ -301,7 +301,7 @@ static int hidraw_open(struct inode *inode, struct file *file) spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); file->private_data = list; out_unlock: - mutex_unlock(&minors_lock); + up_read(&minors_rwsem); out: if (err < 0) kfree(list); @@ -347,7 +347,7 @@ static int hidraw_release(struct inode * inode, struct file * file) struct hidraw_list *list = file->private_data; unsigned long flags; - mutex_lock(&minors_lock); + down_write(&minors_rwsem); spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); list_del(&list->node); @@ -356,7 +356,7 @@ static int hidraw_release(struct inode * inode, struct file * file) drop_ref(hidraw_table[minor], 0); - mutex_unlock(&minors_lock); + up_write(&minors_rwsem); return 0; } @@ -369,7 +369,7 @@ static long hidraw_ioctl(struct file *file, unsigned int cmd, struct hidraw *dev; void __user *user_arg = (void __user*) arg; - mutex_lock(&minors_lock); + down_read(&minors_rwsem); dev = hidraw_table[minor]; if (!dev || !dev->exist) { ret = -ENODEV; @@ -487,7 +487,7 @@ static long hidraw_ioctl(struct file *file, unsigned int cmd, ret = -ENOTTY; } out: - mutex_unlock(&minors_lock); + up_read(&minors_rwsem); return ret; } @@ -546,7 +546,7 @@ int hidraw_connect(struct hid_device *hid) result = -EINVAL; - mutex_lock(&minors_lock); + down_write(&minors_rwsem); for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { if (hidraw_table[minor]) @@ -557,7 +557,7 @@ int hidraw_connect(struct hid_device *hid) } if (result) { - mutex_unlock(&minors_lock); + up_write(&minors_rwsem); kfree(dev); goto out; } @@ -567,7 +567,7 @@ int hidraw_connect(struct hid_device *hid) if (IS_ERR(dev->dev)) { hidraw_table[minor] = NULL; - mutex_unlock(&minors_lock); + up_write(&minors_rwsem); result = PTR_ERR(dev->dev); kfree(dev); goto out; @@ -583,7 +583,7 @@ int hidraw_connect(struct hid_device *hid) dev->exist = 1; hid->hidraw = dev; - mutex_unlock(&minors_lock); + up_write(&minors_rwsem); out: return result; @@ -594,11 +594,11 @@ void hidraw_disconnect(struct hid_device *hid) { struct hidraw *hidraw = hid->hidraw; - mutex_lock(&minors_lock); + down_write(&minors_rwsem); drop_ref(hidraw, 1); - mutex_unlock(&minors_lock); + up_write(&minors_rwsem); } EXPORT_SYMBOL_GPL(hidraw_disconnect); |