[PATCH 1/3] serial: atmel: Don't check for mctrl_gpio_to_gpiod() returning error

[Geert Uytterhoeven]

Since commit 1d267ea6539f2663 ("serial: mctrl-gpio: simplify init
routine"), mctrl_gpio_init() returns failure if the assignment to any
member of the gpio array results in an error pointer.
Since commit c359522194593815 ("serial: mctrl_gpio: Avoid probe failures
in case of missing gpiolib"), mctrl_gpio_to_gpiod() returns NULL in the
!CONFIG_GPIOLIB case.
Hence there is no longer a need to check for mctrl_gpio_to_gpiod()
returning an error value.  A simple NULL check is sufficient.

This follows the spirit of commit 445df7ff3fd1a0a9 ("serial: mctrl-gpio:
drop usages of IS_ERR_OR_NULL") in the mctrl-gpio core.

Signed-off-by: Geert Uytterhoeven <geert+rene...@glider.be>
---
 drivers/tty/serial/atmel_serial.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/tty/serial/atmel_serial.c 
b/drivers/tty/serial/atmel_serial.c
index 19a85d6fe3d20541..e9620a81166b7dc1 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -303,32 +303,28 @@ static unsigned int atmel_get_lines_status(struct 
uart_port *port)
 
        mctrl_gpio_get(atmel_port->gpios, &ret);
 
-       if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(atmel_port->gpios,
-                                               UART_GPIO_CTS))) {
+       if (mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_CTS)) {
                if (ret & TIOCM_CTS)
                        status &= ~ATMEL_US_CTS;
                else
                        status |= ATMEL_US_CTS;
        }
 
-       if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(atmel_port->gpios,
-                                               UART_GPIO_DSR))) {
+       if (mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_DSR)) {
                if (ret & TIOCM_DSR)
                        status &= ~ATMEL_US_DSR;
                else
                        status |= ATMEL_US_DSR;
        }
 
-       if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(atmel_port->gpios,
-                                               UART_GPIO_RI))) {
+       if (mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_RI)) {
                if (ret & TIOCM_RI)
                        status &= ~ATMEL_US_RI;
                else
                        status |= ATMEL_US_RI;
        }
 
-       if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(atmel_port->gpios,
-                                               UART_GPIO_DCD))) {
+       if (mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_DCD)) {
                if (ret & TIOCM_CD)
                        status &= ~ATMEL_US_DCD;
                else
-- 
2.17.1