As explained in Documentation/timers/timers-howto.rst the small amount of milliseconds sometimes produces much longer delays. Replace msleep(1) with usleep_range(1000, 1100). Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> --- drivers/tty/serial/8250/8250_exar.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c index f81d5c4fa232..1a3b27d1bd61 100644 --- a/drivers/tty/serial/8250/8250_exar.c +++ b/drivers/tty/serial/8250/8250_exar.c @@ -177,7 +177,7 @@ static void exar_shutdown(struct uart_port *port) lsr = serial_in(up, UART_LSR); if (lsr & (UART_LSR_TEMT | UART_LSR_THRE)) break; - msleep(1); + usleep_range(1000, 1100); } while (!uart_circ_empty(xmit) && --i); serial8250_do_shutdown(port); -- 2.20.1
