static int ilo_close(struct inode *ip, struct file *fp)
{
int slot;
struct ccb_data *data;
struct ilo_hwinfo *hw;
unsigned long flags;
slot = iminor(ip) % MAX_CCB;
hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
spin_lock(&hw->open_lock);
if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
data = fp->private_data;
spin_lock_irqsave(&hw->alloc_lock, flags);
hw->ccb_alloc[slot] = NULL;
spin_unlock_irqrestore(&hw->alloc_lock, flags);
ilo_ccb_close(hw->ilo_dev, data);
kfree(data);
} else
hw->ccb_alloc[slot]->ccb_cnt--;
spin_unlock(&hw->open_lock);
return 0;
}
static int ilo_open(struct inode *ip, struct file *fp)
{
int slot, error;
struct ccb_data *data;
struct ilo_hwinfo *hw;
unsigned long flags;
slot = iminor(ip) % MAX_CCB;
hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
/* new ccb allocation */
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
spin_lock(&hw->open_lock);
/* each fd private_data holds sw/hw view of ccb */
if (hw->ccb_alloc[slot] == NULL) {
/* create a channel control block for this minor */
error = ilo_ccb_setup(hw, data, slot);
if (error) {
kfree(data);
goto out;
}
data->ccb_cnt = 1;
data->ccb_excl = fp->f_flags & O_EXCL;
data->ilo_hw = hw;
init_waitqueue_head(&data->ccb_waitq);
/* write the ccb to hw */
spin_lock_irqsave(&hw->alloc_lock, flags);
ilo_ccb_open(hw, data, slot);
hw->ccb_alloc[slot] = data;
spin_unlock_irqrestore(&hw->alloc_lock, flags);
/* make sure the channel is functional */
error = ilo_ccb_verify(hw, data);
if (error) {
spin_lock_irqsave(&hw->alloc_lock, flags);
hw->ccb_alloc[slot] = NULL;
spin_unlock_irqrestore(&hw->alloc_lock, flags);
ilo_ccb_close(hw->ilo_dev, data);
kfree(data);
goto out;
}
} else {
kfree(data);
if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
/*
* The channel exists, and either this open
* or a previous open of this channel wants
* exclusive access.
*/
error = -EBUSY;
} else {
hw->ccb_alloc[slot]->ccb_cnt++;
error = 0;
}
}
out:
spin_unlock(&hw->open_lock);
if (!error)
fp->private_data = hw->ccb_alloc[slot];
return error;
}
static int ilo_open(struct inode *ip, struct file *fp)
{
int slot, error;
struct ccb_data *data;
struct ilo_hwinfo *hw;
unsigned long flags;
slot = iminor(ip) % MAX_CCB;
hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
/* */
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
spin_lock(&hw->open_lock);
/* */
if (hw->ccb_alloc[slot] == NULL) {
/* */
error = ilo_ccb_setup(hw, data, slot);
if (error) {
kfree(data);
goto out;
}
data->ccb_cnt = 1;
data->ccb_excl = fp->f_flags & O_EXCL;
data->ilo_hw = hw;
init_waitqueue_head(&data->ccb_waitq);
/* */
spin_lock_irqsave(&hw->alloc_lock, flags);
ilo_ccb_open(hw, data, slot);
hw->ccb_alloc[slot] = data;
spin_unlock_irqrestore(&hw->alloc_lock, flags);
/* */
error = ilo_ccb_verify(hw, data);
if (error) {
spin_lock_irqsave(&hw->alloc_lock, flags);
hw->ccb_alloc[slot] = NULL;
spin_unlock_irqrestore(&hw->alloc_lock, flags);
ilo_ccb_close(hw->ilo_dev, data);
kfree(data);
goto out;
}
} else {
kfree(data);
if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
/*
*/
error = -EBUSY;
} else {
hw->ccb_alloc[slot]->ccb_cnt++;
error = 0;
}
}
out:
spin_unlock(&hw->open_lock);
if (!error)
fp->private_data = hw->ccb_alloc[slot];
return error;
}