From 631ee829489df94f0ebc1c9436846c9c2de52110 Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Tue, 6 Nov 2018 12:57:48 +0000 Subject: [PATCH 151/726] 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 93cf5f788817..6864adaaba7d 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -772,6 +772,8 @@ 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; /* CTSRTS interrupt comes only when CTS goes inactive */ case SC16IS7XX_IIR_CTSRTS_SRC: -- 2.33.1