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path: root/drivers/tty/serial/serial_port.c
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Diffstat (limited to 'drivers/tty/serial/serial_port.c')
-rw-r--r--drivers/tty/serial/serial_port.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/tty/serial/serial_port.c b/drivers/tty/serial/serial_port.c
index 88975a4df306..72b6f4f326e2 100644
--- a/drivers/tty/serial/serial_port.c
+++ b/drivers/tty/serial/serial_port.c
@@ -46,8 +46,31 @@ out:
return 0;
}
+static int serial_port_runtime_suspend(struct device *dev)
+{
+ struct serial_port_device *port_dev = to_serial_base_port_device(dev);
+ struct uart_port *port = port_dev->port;
+ unsigned long flags;
+ bool busy;
+
+ if (port->flags & UPF_DEAD)
+ return 0;
+
+ uart_port_lock_irqsave(port, &flags);
+ busy = __serial_port_busy(port);
+ if (busy)
+ port->ops->start_tx(port);
+ uart_port_unlock_irqrestore(port, flags);
+
+ if (busy)
+ pm_runtime_mark_last_busy(dev);
+
+ return busy ? -EBUSY : 0;
+}
+
static DEFINE_RUNTIME_DEV_PM_OPS(serial_port_pm,
- NULL, serial_port_runtime_resume, NULL);
+ serial_port_runtime_suspend,
+ serial_port_runtime_resume, NULL);
static int serial_port_probe(struct device *dev)
{