Merge tag 'tty-4.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial driver fixes from Greg KH:
 "Here are a number of small tty and serial driver fixes for reported
  issues for 4.9-rc3. Nothing major, but they do resolve a bunch of
  problems with the tty core changes that are in 4.9-rc1, and finally
  the atmel serial driver is back working properly.

  All have been in linux-next with no reported issues"

* tag 'tty-4.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  tty: serial_core: fix NULL struct tty pointer access in uart_write_wakeup
  tty: serial_core: Fix serial console crash on port shutdown
  tty/serial: at91: fix hardware handshake on Atmel platforms
  vt: clear selection before resizing
  sc16is7xx: always write state when configuring GPIO as an output
  sh-sci: document R8A7743/5 support
  tty: serial: 8250: 8250_core: NXP SC16C2552 workaround
  tty: limit terminal size to 4M chars
  tty: serial: fsl_lpuart: Fix Tx DMA edge case
  serial: 8250_lpss: enable MSI for sure
  serial: core: fix console problems on uart_close
  serial: 8250_uniphier: fix clearing divisor latch access bit
  serial: 8250_uniphier: fix more unterminated string
  serial: pch_uart: add terminate entry for dmi_system_id tables
  devicetree: bindings: uart: Add new compatible string for ZynqMP
  serial: xuartps: Add new compatible string for ZynqMP
  serial: SERIAL_STM32 should depend on HAS_DMA
  serial: stm32: Fix comparisons with undefined register
  tty: vt, fix bogus division in csi_J

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 2675792a8f59..fb0672554123 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1130,9 +1130,13 @@ static int sc16is7xx_gpio_direction_output(struct gpio_chip *chip,
 {
 	struct sc16is7xx_port *s = gpiochip_get_data(chip);
 	struct uart_port *port = &s->p[0].port;
+	u8 state = sc16is7xx_port_read(port, SC16IS7XX_IOSTATE_REG);
 
-	sc16is7xx_port_update(port, SC16IS7XX_IOSTATE_REG, BIT(offset),
-			      val ? BIT(offset) : 0);
+	if (val)
+		state |= BIT(offset);
+	else
+		state &= ~BIT(offset);
+	sc16is7xx_port_write(port, SC16IS7XX_IOSTATE_REG, state);
 	sc16is7xx_port_update(port, SC16IS7XX_IODIR_REG, BIT(offset),
 			      BIT(offset));