static int drm_stub_open(struct inode *inode, struct file *filp)
{
const struct file_operations *new_fops;
struct drm_minor *minor;
int err;
DRM_DEBUG("\n");
mutex_lock(&drm_global_mutex);
minor = drm_minor_acquire(iminor(inode));
if (IS_ERR(minor)) {
err = PTR_ERR(minor);
goto out_unlock;
}
new_fops = fops_get(minor->dev->driver->fops);
if (!new_fops) {
err = -ENODEV;
goto out_release;
}
replace_fops(filp, new_fops);
if (filp->f_op->open)
err = filp->f_op->open(inode, filp);
else
err = 0;
out_release:
drm_minor_release(minor);
out_unlock:
mutex_unlock(&drm_global_mutex);
return err;
}
static int dvb_device_open(struct inode *inode, struct file *file)
{
struct dvb_device *dvbdev;
mutex_lock(&dvbdev_mutex);
down_read(&minor_rwsem);
dvbdev = dvb_minors[iminor(inode)];
if (dvbdev && dvbdev->fops) {
int err = 0;
const struct file_operations *new_fops;
new_fops = fops_get(dvbdev->fops);
if (!new_fops)
goto fail;
file->private_data = dvbdev;
replace_fops(file, new_fops);
if (file->f_op->open)
err = file->f_op->open(inode, file);
up_read(&minor_rwsem);
mutex_unlock(&dvbdev_mutex);
return err;
}
fail:
up_read(&minor_rwsem);
mutex_unlock(&dvbdev_mutex);
return -ENODEV;
}
static int snd_open(struct inode *inode, struct file *file)
{
unsigned int minor = iminor(inode);
struct snd_minor *mptr = NULL;
const struct file_operations *new_fops;
int err = 0;
if (minor >= ARRAY_SIZE(snd_minors))
return -ENODEV;
mutex_lock(&sound_mutex);
mptr = snd_minors[minor];
if (mptr == NULL) {
mptr = autoload_device(minor);
if (!mptr) {
mutex_unlock(&sound_mutex);
return -ENODEV;
}
}
new_fops = fops_get(mptr->f_ops);
mutex_unlock(&sound_mutex);
if (!new_fops)
return -ENODEV;
replace_fops(file, new_fops);
if (file->f_op->open)
err = file->f_op->open(inode, file);
return err;
}
