serial: sc16is7xx: Don't spin if no data received

There are multiple causes of interrupts, errors being one, and only the receipt of data warrants continued polling. See: #2676 Signed-off-by: Phil Elwell <[email protected]>
raspberrypi · Oct 21, 2024 · 1d5b818 · 1d5b818
1 parent 1244625
commit 1d5b818
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
@@ -821,6 +821,8 @@ static bool sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
 
 		if (rxlen)
 			sc16is7xx_handle_rx(port, rxlen, iir);
+		else
+			rc = false;
 		break;
 		/* CTSRTS interrupt comes only when CTS goes inactive */
 	case SC16IS7XX_IIR_CTSRTS_SRC: