Original suggestion and proposal from Sukadev Bhattiprolu.
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
return index;
mutex_lock(&tty_mutex);
return index;
mutex_lock(&tty_mutex);
- retval = tty_init_dev(ptm_driver, index, &tty, 1);
+ tty = tty_init_dev(ptm_driver, index, 1);
mutex_unlock(&tty_mutex);
mutex_unlock(&tty_mutex);
+ if (IS_ERR(tty)) {
+ retval = PTR_ERR(tty);
set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
filp->private_data = tty;
set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
filp->private_data = tty;
* relaxed for the (most common) case of reopening a tty.
*/
* relaxed for the (most common) case of reopening a tty.
*/
-int tty_init_dev(struct tty_driver *driver, int idx,
- struct tty_struct **ret_tty, int first_ok)
+struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
+ int first_ok)
{
struct tty_struct *tty, *o_tty;
struct ktermios *tp, **tp_loc, *o_tp, **o_tp_loc;
struct ktermios *ltp, **ltp_loc, *o_ltp, **o_ltp_loc;
{
struct tty_struct *tty, *o_tty;
struct ktermios *tp, **tp_loc, *o_tp, **o_tp_loc;
struct ktermios *ltp, **ltp_loc, *o_ltp, **o_ltp_loc;
/* check whether we're reopening an existing tty */
tty = tty_driver_lookup_tty(driver, idx);
/* check whether we're reopening an existing tty */
tty = tty_driver_lookup_tty(driver, idx);
- if (IS_ERR(tty)) {
- retval = PTR_ERR(tty);
- goto end_init;
- }
+
+ if (IS_ERR(tty))
+ return tty;
if (tty) {
retval = tty_reopen(tty);
if (retval)
if (tty) {
retval = tty_reopen(tty);
if (retval)
- return retval;
- *ret_tty = tty;
- return 0;
+ return ERR_PTR(retval);
+ return tty;
}
/* Check if pty master is being opened multiple times */
if (driver->subtype == PTY_TYPE_MASTER &&
}
/* Check if pty master is being opened multiple times */
if (driver->subtype == PTY_TYPE_MASTER &&
- (driver->flags & TTY_DRIVER_DEVPTS_MEM) && !first_ok) {
- retval = -EIO;
- goto end_init;
- }
+ (driver->flags & TTY_DRIVER_DEVPTS_MEM) && !first_ok)
+ return ERR_PTR(-EIO);
+
/*
* First time open is complex, especially for PTY devices.
* This code guarantees that either everything succeeds and the
/*
* First time open is complex, especially for PTY devices.
* This code guarantees that either everything succeeds and the
* and locked termios may be retained.)
*/
* and locked termios may be retained.)
*/
- if (!try_module_get(driver->owner)) {
- retval = -ENODEV;
- goto end_init;
- }
+ if (!try_module_get(driver->owner))
+ return ERR_PTR(-ENODEV);
o_tty = NULL;
tp = o_tp = NULL;
o_tty = NULL;
tp = o_tp = NULL;
tty_driver_kref_get(driver);
tty->count++;
tty_driver_kref_get(driver);
tty->count++;
- if (tty_driver_install_tty(driver, tty) < 0)
+ retval = tty_driver_install_tty(driver, tty);
+ if (retval < 0)
*/
retval = tty_ldisc_setup(tty, o_tty);
*/
retval = tty_ldisc_setup(tty, o_tty);
if (retval)
goto release_mem_out;
if (retval)
goto release_mem_out;
-
- *ret_tty = tty;
- /* All paths come through here to release the mutex */
-end_init:
- return retval;
/* Release locally allocated memory ... nothing placed in slots */
free_mem_out:
/* Release locally allocated memory ... nothing placed in slots */
free_mem_out:
fail_no_mem:
module_put(driver->owner);
fail_no_mem:
module_put(driver->owner);
- retval = -ENOMEM;
- goto end_init;
+ return ERR_PTR(-ENOMEM);
/* call the tty release_tty routine to clean out this slot */
release_mem_out:
/* call the tty release_tty routine to clean out this slot */
release_mem_out:
printk(KERN_INFO "tty_init_dev: ldisc open failed, "
"clearing slot %d\n", idx);
release_tty(tty, idx);
printk(KERN_INFO "tty_init_dev: ldisc open failed, "
"clearing slot %d\n", idx);
release_tty(tty, idx);
+ return ERR_PTR(retval);
}
void tty_free_termios(struct tty_struct *tty)
}
void tty_free_termios(struct tty_struct *tty)
return -ENODEV;
}
got_driver:
return -ENODEV;
}
got_driver:
- retval = tty_init_dev(driver, index, &tty, 0);
+ tty = tty_init_dev(driver, index, 0);
mutex_unlock(&tty_mutex);
tty_driver_kref_put(driver);
mutex_unlock(&tty_mutex);
tty_driver_kref_put(driver);
- if (retval)
- return retval;
+ if (IS_ERR(tty))
+ return PTR_ERR(tty);
filp->private_data = tty;
file_move(filp, &tty->tty_files);
filp->private_data = tty;
file_move(filp, &tty->tty_files);
extern void proc_clear_tty(struct task_struct *p);
extern struct tty_struct *get_current_tty(void);
extern void tty_default_fops(struct file_operations *fops);
extern void proc_clear_tty(struct task_struct *p);
extern struct tty_struct *get_current_tty(void);
extern void tty_default_fops(struct file_operations *fops);
-extern int tty_init_dev(struct tty_driver *driver, int idx,
- struct tty_struct **ret_tty, int first_ok);
+extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
+ int first_ok);
extern void tty_release_dev(struct file *filp);
extern struct mutex tty_mutex;
extern void tty_release_dev(struct file *filp);
extern struct mutex tty_mutex;