From 9ca74c53cbda1f104bce3b33850fd3bf33eb3793 Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Tue, 6 Nov 2018 12:57:48 +0000 Subject: [PATCH 483/496] sc16is7xx: Don't spin if no data received See: https://github.com/raspberrypi/linux/issues/2676 Signed-off-by: Phil Elwell --- drivers/tty/serial/sc16is7xx.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index 97fcacc00003..444d354d12d6 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -701,6 +701,8 @@ static bool sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno) rxlen = sc16is7xx_port_read(port, SC16IS7XX_RXLVL_REG); if (rxlen) sc16is7xx_handle_rx(port, rxlen, iir); + else + return false; break; case SC16IS7XX_IIR_THRI_SRC: sc16is7xx_handle_tx(port); -- 2.19.1