tty_lock: Localise the lock
In each remaining case the tty_lock is associated with a specific tty. This
means we can now lock on a per tty basis. We do need tty_lock_pair() for
the pty case. Uglier but still a step in the right direction.
[fixed up calls in 3 missing drivers - gregkh]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 24b95db..fa65cde 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -567,7 +567,7 @@
if (IS_ERR(new_ldisc))
return PTR_ERR(new_ldisc);
- tty_lock();
+ tty_lock(tty);
/*
* We need to look at the tty locking here for pty/tty pairs
* when both sides try to change in parallel.
@@ -581,12 +581,12 @@
*/
if (tty->ldisc->ops->num == ldisc) {
- tty_unlock();
+ tty_unlock(tty);
tty_ldisc_put(new_ldisc);
return 0;
}
- tty_unlock();
+ tty_unlock(tty);
/*
* Problem: What do we do if this blocks ?
* We could deadlock here
@@ -594,7 +594,7 @@
tty_wait_until_sent(tty, 0);
- tty_lock();
+ tty_lock(tty);
mutex_lock(&tty->ldisc_mutex);
/*
@@ -604,10 +604,10 @@
while (test_bit(TTY_LDISC_CHANGING, &tty->flags)) {
mutex_unlock(&tty->ldisc_mutex);
- tty_unlock();
+ tty_unlock(tty);
wait_event(tty_ldisc_wait,
test_bit(TTY_LDISC_CHANGING, &tty->flags) == 0);
- tty_lock();
+ tty_lock(tty);
mutex_lock(&tty->ldisc_mutex);
}
@@ -622,7 +622,7 @@
o_ldisc = tty->ldisc;
- tty_unlock();
+ tty_unlock(tty);
/*
* Make sure we don't change while someone holds a
* reference to the line discipline. The TTY_LDISC bit
@@ -649,7 +649,7 @@
retval = tty_ldisc_wait_idle(tty, 5 * HZ);
- tty_lock();
+ tty_lock(tty);
mutex_lock(&tty->ldisc_mutex);
/* handle wait idle failure locked */
@@ -664,7 +664,7 @@
clear_bit(TTY_LDISC_CHANGING, &tty->flags);
mutex_unlock(&tty->ldisc_mutex);
tty_ldisc_put(new_ldisc);
- tty_unlock();
+ tty_unlock(tty);
return -EIO;
}
@@ -707,7 +707,7 @@
if (o_work)
schedule_work(&o_tty->buf.work);
mutex_unlock(&tty->ldisc_mutex);
- tty_unlock();
+ tty_unlock(tty);
return retval;
}
@@ -815,11 +815,11 @@
* need to wait for another function taking the BTM
*/
clear_bit(TTY_LDISC, &tty->flags);
- tty_unlock();
+ tty_unlock(tty);
cancel_work_sync(&tty->buf.work);
mutex_unlock(&tty->ldisc_mutex);
retry:
- tty_lock();
+ tty_lock(tty);
mutex_lock(&tty->ldisc_mutex);
/* At this point we have a closed ldisc and we want to
@@ -830,7 +830,7 @@
if (atomic_read(&tty->ldisc->users) != 1) {
char cur_n[TASK_COMM_LEN], tty_n[64];
long timeout = 3 * HZ;
- tty_unlock();
+ tty_unlock(tty);
while (tty_ldisc_wait_idle(tty, timeout) == -EBUSY) {
timeout = MAX_SCHEDULE_TIMEOUT;
@@ -911,10 +911,10 @@
* race with the set_ldisc code path.
*/
- tty_unlock();
+ tty_unlock(tty);
tty_ldisc_halt(tty);
tty_ldisc_flush_works(tty);
- tty_lock();
+ tty_lock(tty);
mutex_lock(&tty->ldisc_mutex);
/*