From 0b9eafa294015a9c7d4b2f39a39997164aae5d63 Mon Sep 17 00:00:00 2001
From: sgalabov <sgalabov@FreeBSD.org>
Date: Fri, 8 Apr 2016 15:28:12 +0000
Subject: Introduce better locking for mtk_gpio_v[12] drivers

Approved by:	adrian (mentor)
Sponsored by:	Smartcom - Bulgaria AD
Differential Revision:	https://reviews.freebsd.org/D5887
---
 sys/mips/mediatek/mtk_gpio_v1.c | 49 +++++++++++++++++++++++++++++++--------
 sys/mips/mediatek/mtk_gpio_v2.c | 51 ++++++++++++++++++++++++++++++++---------
 2 files changed, 79 insertions(+), 21 deletions(-)

(limited to 'sys/mips')

diff --git a/sys/mips/mediatek/mtk_gpio_v1.c b/sys/mips/mediatek/mtk_gpio_v1.c
index 1882029..29b2258 100644
--- a/sys/mips/mediatek/mtk_gpio_v1.c
+++ b/sys/mips/mediatek/mtk_gpio_v1.c
@@ -431,19 +431,29 @@ mtk_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
 static int
 mtk_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
 {
-	struct mtk_gpio_softc *sc = device_get_softc(dev);
+	struct mtk_gpio_softc *sc;
+	int ret;
+
+	sc = device_get_softc(dev);
+	ret = 0;
 
-	if (pin >= sc->num_pins || !(sc->pins[pin].pin_flags & GPIO_PIN_OUTPUT))
+	if (pin >= sc->num_pins)
 		return (EINVAL);
 
 	MTK_GPIO_LOCK(sc);
+	if(!(sc->pins[pin].pin_flags & GPIO_PIN_OUTPUT)) {
+		ret = EINVAL;
+		goto out;
+	}
+
 	if (value)
 		MTK_WRITE_4(sc, GPIO_PIOSET(sc), (1u << pin));
 	else
 		MTK_WRITE_4(sc, GPIO_PIORESET(sc), (1u << pin));
-	MTK_GPIO_UNLOCK(sc);
 
-	return (0);
+out:
+	MTK_GPIO_UNLOCK(sc);
+	return (ret);
 }
 
 static int
@@ -451,33 +461,50 @@ mtk_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
 {
 	struct mtk_gpio_softc *sc;
 	uint32_t data;
+	int ret;
 
 	sc = device_get_softc(dev);
+	ret = 0;
 
-	if (pin >= sc->num_pins || !(sc->pins[pin].pin_flags & GPIO_PIN_INPUT))
+	if (pin >= sc->num_pins)
 		return (EINVAL);
 
 	MTK_GPIO_LOCK(sc);
+	if(!(sc->pins[pin].pin_flags & GPIO_PIN_INPUT)) {
+		ret = EINVAL;
+		goto out;
+	}
 	data = MTK_READ_4(sc, GPIO_PIODATA(sc));
-	MTK_GPIO_UNLOCK(sc);
 	*val = (data & (1u << pin)) ? 1 : 0;
 
-	return (0);
+out:
+	MTK_GPIO_UNLOCK(sc);
+	return (ret);
 }
 
 static int
 mtk_gpio_pin_toggle(device_t dev, uint32_t pin)
 {
-	struct mtk_gpio_softc *sc = device_get_softc(dev);
+	struct mtk_gpio_softc *sc;
+	int ret;
 
-	if (pin >= sc->num_pins || !(sc->pins[pin].pin_flags & GPIO_PIN_OUTPUT))
+	if (pin >= sc->num_pins)
 		return (EINVAL);
 
+	sc = device_get_softc(dev);
+	ret = 0;
+
 	MTK_GPIO_LOCK(sc);
+	if (!(sc->pins[pin].pin_flags & GPIO_PIN_OUTPUT)) {
+		ret = EINVAL;
+		goto out;
+	}
 	MTK_WRITE_4(sc, GPIO_PIOTOG(sc), (1u << pin));
+
+out:
 	MTK_GPIO_UNLOCK(sc);
 
-	return (0);
+	return (ret);
 }
 
 static int
@@ -571,7 +598,9 @@ mtk_gpio_pic_post_filter(device_t dev, struct intr_irqsrc *isrc)
 
 	pisrc = (struct mtk_gpio_pin_irqsrc *)isrc;
 	sc = device_get_softc(dev);
+	MTK_GPIO_LOCK(sc);
 	MTK_WRITE_4(sc, GPIO_PIOINT(sc), 1u << pisrc->irq);
+	MTK_GPIO_UNLOCK(sc);
 }
 
 static int
diff --git a/sys/mips/mediatek/mtk_gpio_v2.c b/sys/mips/mediatek/mtk_gpio_v2.c
index 543133c..282b112 100644
--- a/sys/mips/mediatek/mtk_gpio_v2.c
+++ b/sys/mips/mediatek/mtk_gpio_v2.c
@@ -425,19 +425,29 @@ mtk_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
 static int
 mtk_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
 {
-	struct mtk_gpio_softc *sc = device_get_softc(dev);
+	struct mtk_gpio_softc *sc;
+	int ret;
 
-	if (pin >= sc->num_pins || !(sc->pins[pin].pin_flags & GPIO_PIN_OUTPUT))
+	if (pin >= sc->num_pins)
 		return (EINVAL);
 
+	sc = device_get_softc(dev);
+	ret = 0;
+
 	MTK_GPIO_LOCK(sc);
+	if (!(sc->pins[pin].pin_flags & GPIO_PIN_OUTPUT)) {
+		ret = EINVAL;
+		goto out;
+	}
 	if (value)
 		MTK_WRITE_4(sc, GPIO_PIOSET(sc), (1u << pin));
 	else
 		MTK_WRITE_4(sc, GPIO_PIORESET(sc), (1u << pin));
+
+out:
 	MTK_GPIO_UNLOCK(sc);
 
-	return (0);
+	return (ret);
 }
 
 static int
@@ -445,39 +455,56 @@ mtk_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
 {
 	struct mtk_gpio_softc *sc;
 	uint32_t data;
+	int ret;
 
-	sc = device_get_softc(dev);
-
-	if (pin >= sc->num_pins || !(sc->pins[pin].pin_flags & GPIO_PIN_INPUT))
+	if (pin >= sc->num_pins)
 		return (EINVAL);
 
+	sc = device_get_softc(dev);
+	ret = 0;
+
 	MTK_GPIO_LOCK(sc);
+	if (!(sc->pins[pin].pin_flags & GPIO_PIN_INPUT)) {
+		ret = EINVAL;
+		goto out;
+	}
 	data = MTK_READ_4(sc, GPIO_PIODATA(sc));
-	MTK_GPIO_UNLOCK(sc);
 	*val = (data & (1u << pin)) ? 1 : 0;
 
-	return (0);
+out:
+	MTK_GPIO_UNLOCK(sc);
+	return (ret);
 }
 
 static int
 mtk_gpio_pin_toggle(device_t dev, uint32_t pin)
 {
-	struct mtk_gpio_softc *sc = device_get_softc(dev);
+	struct mtk_gpio_softc *sc;
 	uint32_t val;
+	int ret;
 
-	if (pin >= sc->num_pins || !(sc->pins[pin].pin_flags & GPIO_PIN_OUTPUT))
+	if (pin >= sc->num_pins)
 		return (EINVAL);
 
+	sc = device_get_softc(dev);
+	ret = 0;
+
 	MTK_GPIO_LOCK(sc);
+	if(!(sc->pins[pin].pin_flags & GPIO_PIN_OUTPUT)) {
+		ret = EINVAL;
+		goto out;
+	}
 	val = MTK_READ_4(sc, GPIO_PIODATA(sc));
 	val &= (1u << pin);
 	if (val)
 		MTK_WRITE_4(sc, GPIO_PIORESET(sc), (1u << pin));
 	else
 		MTK_WRITE_4(sc, GPIO_PIOSET(sc), (1u << pin));
+
+out:
 	MTK_GPIO_UNLOCK(sc);
 
-	return (0);
+	return (ret);
 }
 
 static int
@@ -571,7 +598,9 @@ mtk_gpio_pic_post_filter(device_t dev, struct intr_irqsrc *isrc)
 
 	pisrc = (struct mtk_gpio_pin_irqsrc *)isrc;
 	sc = device_get_softc(dev);
+	MTK_GPIO_LOCK(sc);
 	MTK_WRITE_4(sc, GPIO_PIOINT(sc), 1u << pisrc->irq);
+	MTK_GPIO_UNLOCK(sc);
 }
 
 static int
-- 
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