diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2015-07-31 23:59:51 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-05 08:07:22 +0300 |
| commit | 6fb98fb3031359af42a6ee6984b477cbcfdca7bd (patch) | |
| tree | 66929be0c0f0466f5caf9d9bbdb9e70869b8744f /drivers/tty | |
| parent | 2a0e5ef6cfa24351791fbd4339f562211b83afae (diff) | |
| download | linux-6fb98fb3031359af42a6ee6984b477cbcfdca7bd.tar.xz | |
serial: core: Use proper spinlock flavor in uart_close()
uart_close() runs in non-atomic context only; use
spin_lock/unlock_irq instead of saving the interrupt state (which
== on).
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index f36852067f20..6ae7cc118ac4 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1377,7 +1377,6 @@ static void uart_close(struct tty_struct *tty, struct file *filp) struct uart_state *state = tty->driver_data; struct tty_port *port; struct uart_port *uport; - unsigned long flags; if (!state) { struct uart_driver *drv = tty->driver->driver_state; @@ -1403,10 +1402,9 @@ static void uart_close(struct tty_struct *tty, struct file *filp) * disable the receive line status interrupts. */ if (port->flags & ASYNC_INITIALIZED) { - unsigned long flags; - spin_lock_irqsave(&uport->lock, flags); + spin_lock_irq(&uport->lock); uport->ops->stop_rx(uport); - spin_unlock_irqrestore(&uport->lock, flags); + spin_unlock_irq(&uport->lock); /* * Before we drop DTR, make sure the UART transmitter * has completely drained; this is especially @@ -1419,17 +1417,17 @@ static void uart_close(struct tty_struct *tty, struct file *filp) uart_shutdown(tty, state); tty_port_tty_set(port, NULL); - spin_lock_irqsave(&port->lock, flags); + spin_lock_irq(&port->lock); if (port->blocked_open) { - spin_unlock_irqrestore(&port->lock, flags); + spin_unlock_irq(&port->lock); if (port->close_delay) msleep_interruptible(jiffies_to_msecs(port->close_delay)); - spin_lock_irqsave(&port->lock, flags); + spin_lock_irq(&port->lock); } else if (!uart_console(uport)) { - spin_unlock_irqrestore(&port->lock, flags); + spin_unlock_irq(&port->lock); uart_change_pm(state, UART_PM_STATE_OFF); - spin_lock_irqsave(&port->lock, flags); + spin_lock_irq(&port->lock); } /* @@ -1437,7 +1435,7 @@ static void uart_close(struct tty_struct *tty, struct file *filp) */ clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); clear_bit(ASYNCB_CLOSING, &port->flags); - spin_unlock_irqrestore(&port->lock, flags); + spin_unlock_irq(&port->lock); wake_up_interruptible(&port->open_wait); wake_up_interruptible(&port->close_wait); |