linux-kernel - [PATCH 11/14] serial: 8250_dw: simplify optional reset handling

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Message-Id: <20170130114116.22089-11-p.zabel@pengutronix.de>
Date:   Mon, 30 Jan 2017 12:41:13 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org,
        Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 11/14] 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@...gutronix.de>
Cc: Chen-Yu Tsai <wens@...e.org>
Cc: Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/tty/serial/8250/8250_dw.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index c89fafc972b69..b8b911adff471 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -503,12 +503,11 @@ 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);
 
@@ -540,8 +539,7 @@ 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))
@@ -562,8 +560,7 @@ 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);
-- 
2.11.0