sc16is7xx: Don't spin if no data received

Phil Elwell · popcornmix · commit f85b3ee36cc1 · 2018-11-23T17:12:45.000Z
See: #2676 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
@@ -678,6 +678,8 @@ 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);
