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| author | Peter Hurley <peter@hurleysoftware.com> | 2016-04-09 17:53:22 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-04-30 09:26:55 -0700 |
| commit | 807c8d81f4ec441241cafa3034c58df721fee869 (patch) | |
| tree | 83402ad7f36b135d15d1aa6686ff26aa186b3dec /drivers/tty/synclink_gt.c | |
| parent | 5604a98e2f95d6221852960a3363588f40d78e22 (diff) | |
| download | linux-807c8d81f4ec441241cafa3034c58df721fee869.tar.gz linux-807c8d81f4ec441241cafa3034c58df721fee869.tar.bz2 linux-807c8d81f4ec441241cafa3034c58df721fee869.zip | |
tty: Replace ASYNC_NORMAL_ACTIVE bit and update atomically
Replace ASYNC_NORMAL_ACTIVE bit in the tty_port::flags field with
TTY_PORT_ACTIVE bit in the tty_port::iflags field. Introduce helpers
tty_port_set_active() and tty_port_active() to abstract atomic bit ops.
Extract state changes from port lock sections, as this usage is
broken and confused; the state transitions are protected by the
tty lock (which mutually excludes parallel open/close/hangup),
and no user tests the active state while holding the port lock.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/synclink_gt.c')
| -rw-r--r-- | drivers/tty/synclink_gt.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c index 5da69d30f816..c76f546697dc 100644 --- a/drivers/tty/synclink_gt.c +++ b/drivers/tty/synclink_gt.c @@ -756,9 +756,9 @@ static void hangup(struct tty_struct *tty) spin_lock_irqsave(&info->port.lock, flags); info->port.count = 0; - info->port.flags &= ~ASYNC_NORMAL_ACTIVE; info->port.tty = NULL; spin_unlock_irqrestore(&info->port.lock, flags); + tty_port_set_active(&info->port, 0); mutex_unlock(&info->port.mutex); wake_up_interruptible(&info->port.open_wait); @@ -3268,7 +3268,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp, if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) { /* nonblock mode is set or port is not enabled */ - port->flags |= ASYNC_NORMAL_ACTIVE; + tty_port_set_active(port, 1); return 0; } @@ -3325,7 +3325,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp, port->blocked_open--; if (!retval) - port->flags |= ASYNC_NORMAL_ACTIVE; + tty_port_set_active(port, 1); DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval)); return retval; |