tty: Simplify tty_release() state checks
The local o_tty variable in tty_release() is now accessed only when closing the pty master. Set o_tty to slave pty when closing pty master, otherwise NULL; use o_tty != NULL as replacement for pty_master. Reviewed-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
359b9fb5c4
commit
7ffb6da93c
@ -1759,8 +1759,8 @@ static int tty_release_checks(struct tty_struct *tty, int idx)
|
||||
int tty_release(struct inode *inode, struct file *filp)
|
||||
{
|
||||
struct tty_struct *tty = file_tty(filp);
|
||||
struct tty_struct *o_tty;
|
||||
int pty_master, do_sleep, final;
|
||||
struct tty_struct *o_tty = NULL;
|
||||
int do_sleep, final;
|
||||
int idx;
|
||||
char buf[64];
|
||||
|
||||
@ -1773,10 +1773,9 @@ int tty_release(struct inode *inode, struct file *filp)
|
||||
__tty_fasync(-1, filp, 0);
|
||||
|
||||
idx = tty->index;
|
||||
pty_master = (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
|
||||
tty->driver->subtype == PTY_TYPE_MASTER);
|
||||
/* Review: parallel close */
|
||||
o_tty = tty->link;
|
||||
if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
|
||||
tty->driver->subtype == PTY_TYPE_MASTER)
|
||||
o_tty = tty->link;
|
||||
|
||||
if (tty_release_checks(tty, idx)) {
|
||||
tty_unlock(tty);
|
||||
@ -1820,7 +1819,7 @@ int tty_release(struct inode *inode, struct file *filp)
|
||||
do_sleep++;
|
||||
}
|
||||
}
|
||||
if (pty_master && o_tty->count <= 1) {
|
||||
if (o_tty && o_tty->count <= 1) {
|
||||
if (waitqueue_active(&o_tty->read_wait)) {
|
||||
wake_up_poll(&o_tty->read_wait, POLLIN);
|
||||
do_sleep++;
|
||||
@ -1838,7 +1837,7 @@ int tty_release(struct inode *inode, struct file *filp)
|
||||
schedule();
|
||||
}
|
||||
|
||||
if (pty_master) {
|
||||
if (o_tty) {
|
||||
if (--o_tty->count < 0) {
|
||||
printk(KERN_WARNING "%s: bad pty slave count (%d) for %s\n",
|
||||
__func__, o_tty->count, tty_name(o_tty, buf));
|
||||
@ -1872,13 +1871,13 @@ int tty_release(struct inode *inode, struct file *filp)
|
||||
if (!tty->count) {
|
||||
read_lock(&tasklist_lock);
|
||||
session_clear_tty(tty->session);
|
||||
if (pty_master)
|
||||
if (o_tty)
|
||||
session_clear_tty(o_tty->session);
|
||||
read_unlock(&tasklist_lock);
|
||||
}
|
||||
|
||||
/* check whether both sides are closing ... */
|
||||
final = !tty->count && !(pty_master && o_tty->count);
|
||||
final = !tty->count && !(o_tty && o_tty->count);
|
||||
|
||||
tty_unlock_pair(tty, o_tty);
|
||||
/* At this point, the tty->count == 0 should ensure a dead tty
|
||||
|
Loading…
Reference in New Issue
Block a user