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authorPeter Hurley <peter@hurleysoftware.com>2016-04-10 00:53:22 (GMT)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-30 16:26:55 (GMT)
commit807c8d81f4ec441241cafa3034c58df721fee869 (patch)
tree83402ad7f36b135d15d1aa6686ff26aa186b3dec /drivers/tty/synclinkmp.c
parent5604a98e2f95d6221852960a3363588f40d78e22 (diff)
downloadlinux-807c8d81f4ec441241cafa3034c58df721fee869.tar.xz
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/synclinkmp.c')
-rw-r--r--drivers/tty/synclinkmp.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c
index 7a21491..95eddc4 100644
--- a/drivers/tty/synclinkmp.c
+++ b/drivers/tty/synclinkmp.c
@@ -849,9 +849,9 @@ 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, 1);
mutex_unlock(&info->port.mutex);
wake_up_interruptible(&info->port.open_wait);
@@ -3285,7 +3285,7 @@ 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 */
/* just verify that callout device is not active */
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
return 0;
}
@@ -3352,7 +3352,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
__FILE__,__LINE__, tty->driver->name, port->count );
if (!retval)
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
return retval;
}