From 611e0d83a83724340d4bf0eed610af01401b2ff4 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Sun, 10 Jan 2016 14:39:35 -0800 Subject: [PATCH] serial: 8250: Wait for irq to complete before shutdown After masking all interrupts, wait for the irq handler to complete before continuing shutdown. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_port.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 9ef77a52c4f2..57b3a80b4359 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -2088,8 +2088,12 @@ void serial8250_do_shutdown(struct uart_port *port) /* * Disable interrupts from this port */ + spin_lock_irqsave(&port->lock, flags); up->ier = 0; serial_port_out(port, UART_IER, 0); + spin_unlock_irqrestore(&port->lock, flags); + + synchronize_irq(port->irq); if (up->dma) serial8250_release_dma(up); -- 2.20.1