[PATCH] tty: serial: fsl_lpuart: Fix lpuart_flush_buffer()

[Andrey Smirnov]

Fix incorrect read-modify-write sequence in lpuart_flush_buffer() that
was reading from UARTPFIFO and writing to UARTCFIFO instead of
operating solely on the latter.

Fixes: 9bc19af9dacb ("tty: serial: fsl_lpuart: Flush HW FIFOs in .flush_buffer")
Signed-off-by: Andrey Smirnov <andrew.smir...@gmail.com>
Cc: Stefan Agner <ste...@agner.ch>
Cc: Andrew Lunn <and...@lunn.ch>
Cc: Vivien Didelot <vivien.dide...@gmail.com>
Cc: Chris Healy <cphe...@gmail.com>
Cc: Cory Tusar <cory.tu...@zii.aero>
Cc: Lucas Stach <l.st...@pengutronix.de>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Jiri Slaby <jsl...@suse.com>
Cc: linux-...@nxp.com
Cc: linux-ser...@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---

Greg:

This bug causes occasional boot hang on 5.4-rc1 on Vybrid, so it might
be good to push that for 5.4-rc2.

Thanks,
Andrey Sirnov

 drivers/tty/serial/fsl_lpuart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 3e17bb8a0b16..537896c4d887 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -548,7 +548,7 @@ static void lpuart_flush_buffer(struct uart_port *port)
                val |= UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH;
                lpuart32_write(&sport->port, val, UARTFIFO);
        } else {
-               val = readb(sport->port.membase + UARTPFIFO);
+               val = readb(sport->port.membase + UARTCFIFO);
                val |= UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH;
                writeb(val, sport->port.membase + UARTCFIFO);
        }
-- 
2.21.0