serial: 8250_dw: simplify optional reset handling

As of commit bb475230b8e5 ("reset: make optional functions really
optional"), the reset framework API calls use NULL pointers to describe
optional, non-present reset controls.

This allows to return errors from devm_reset_control_get_optional and to
call reset_control_(de)assert unconditionally.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 6ee55a2..e0215db 100644 (file)
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -525,12 +525,11 @@ static int dw8250_probe(struct platform_device *pdev)
        }
 
        data->rst = devm_reset_control_get_optional(dev, NULL);
-       if (IS_ERR(data->rst) && PTR_ERR(data->rst) == -EPROBE_DEFER) {
-               err = -EPROBE_DEFER;
+       if (IS_ERR(data->rst)) {
+               err = PTR_ERR(data->rst);
                goto err_pclk;
        }
-       if (!IS_ERR(data->rst))
-               reset_control_deassert(data->rst);
+       reset_control_deassert(data->rst);
 
        dw8250_quirks(p, data);
 
@@ -562,8 +561,7 @@ static int dw8250_probe(struct platform_device *pdev)
        return 0;
 
 err_reset:
-       if (!IS_ERR(data->rst))
-               reset_control_assert(data->rst);
+       reset_control_assert(data->rst);
 
 err_pclk:
        if (!IS_ERR(data->pclk))
@@ -584,8 +582,7 @@ static int dw8250_remove(struct platform_device *pdev)
 
        serial8250_unregister_port(data->line);
 
-       if (!IS_ERR(data->rst))
-               reset_control_assert(data->rst);
+       reset_control_assert(data->rst);
 
        if (!IS_ERR(data->pclk))
                clk_disable_unprepare(data->pclk);