[PATCH AUTOSEL 4.4 36/44] pinctrl: at91-pio4: fix has_config check in atmel_pctl_dt_subnode_to_map()

[PATCH AUTOSEL 4.4 36/44] pinctrl: at91-pio4: fix has_config check in atmel_pctl_dt_subnode_to_map()

[Sasha Levin]

From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit b97760ae8e3dc8bb91881c13425a0bff55f2bd85 ]

Smatch complains about this condition:

	if (has_config && num_pins >= 1)

The "has_config" variable is either uninitialized or true.  The
"num_pins" variable is unsigned and we verified that it is non-zero on
the lines before so we know "num_pines >= 1" is true.  Really, we could
just check "num_configs" directly and remove the "has_config" variable.

Fixes: 776180848b57 ("pinctrl: introduce driver for Atmel PIO4 controller")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pinctrl/pinctrl-at91-pio4.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
index 9aa82a4e9e254..b4420a0bf7d66 100644
--- a/drivers/pinctrl/pinctrl-at91-pio4.c
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -477,7 +477,6 @@ static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 	unsigned num_pins, num_configs, reserve;
 	unsigned long *configs;
 	struct property	*pins;
-	bool has_config;
 	u32 pinfunc;
 	int ret, i;
 
@@ -493,9 +492,6 @@ static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 		return ret;
 	}
 
-	if (num_configs)
-		has_config = true;
-
 	num_pins = pins->length / sizeof(u32);
 	if (!num_pins) {
 		dev_err(pctldev->dev, "no pins found in node %s\n",
@@ -508,7 +504,7 @@ static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 	 * map for each pin.
 	 */
 	reserve = 1;
-	if (has_config && num_pins >= 1)
+	if (num_configs)
 		reserve++;
 	reserve *= num_pins;
 	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
@@ -531,7 +527,7 @@ static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 		pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
 					  group, func);
 
-		if (has_config) {
+		if (num_configs) {
 			ret = pinctrl_utils_add_map_configs(pctldev, map,
 					reserved_maps, num_maps, group,
 					configs, num_configs,
-- 
2.20.1

[PATCH AUTOSEL 4.4 40/44] pinctrl: at91: don't use the same irqchip with multiple gpiochips

[Sasha Levin]

From: Ludovic Desroches <ludovic.desroches@microchip.com>

[ Upstream commit 0c3dfa176912b5f87732545598200fb55e9c1978 ]

Sharing the same irqchip with multiple gpiochips is not a good
practice. For instance, when installing hooks, we change the state
of the irqchip. The initial state of the irqchip for the second
gpiochip to register is then disrupted.

Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pinctrl/pinctrl-at91.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index 0d2fc0cff35ee..52bbd34f7d0d9 100644
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c
@@ -1556,16 +1556,6 @@ void at91_pinctrl_gpio_resume(void)
 #define gpio_irq_set_wake	NULL
 #endif /* CONFIG_PM */
 
-static struct irq_chip gpio_irqchip = {
-	.name		= "GPIO",
-	.irq_ack	= gpio_irq_ack,
-	.irq_disable	= gpio_irq_mask,
-	.irq_mask	= gpio_irq_mask,
-	.irq_unmask	= gpio_irq_unmask,
-	/* .irq_set_type is set dynamically */
-	.irq_set_wake	= gpio_irq_set_wake,
-};
-
 static void gpio_irq_handler(struct irq_desc *desc)
 {
 	struct irq_chip *chip = irq_desc_get_chip(desc);
@@ -1608,12 +1598,22 @@ static int at91_gpio_of_irq_setup(struct platform_device *pdev,
 	struct gpio_chip	*gpiochip_prev = NULL;
 	struct at91_gpio_chip   *prev = NULL;
 	struct irq_data		*d = irq_get_irq_data(at91_gpio->pioc_virq);
+	struct irq_chip		*gpio_irqchip;
 	int ret, i;
 
+	gpio_irqchip = devm_kzalloc(&pdev->dev, sizeof(*gpio_irqchip), GFP_KERNEL);
+	if (!gpio_irqchip)
+		return -ENOMEM;
+
 	at91_gpio->pioc_hwirq = irqd_to_hwirq(d);
 
-	/* Setup proper .irq_set_type function */
-	gpio_irqchip.irq_set_type = at91_gpio->ops->irq_type;
+	gpio_irqchip->name = "GPIO";
+	gpio_irqchip->irq_ack = gpio_irq_ack;
+	gpio_irqchip->irq_disable = gpio_irq_mask;
+	gpio_irqchip->irq_mask = gpio_irq_mask;
+	gpio_irqchip->irq_unmask = gpio_irq_unmask;
+	gpio_irqchip->irq_set_wake = gpio_irq_set_wake,
+	gpio_irqchip->irq_set_type = at91_gpio->ops->irq_type;
 
 	/* Disable irqs of this PIO controller */
 	writel_relaxed(~0, at91_gpio->regbase + PIO_IDR);
@@ -1624,7 +1624,7 @@ static int at91_gpio_of_irq_setup(struct platform_device *pdev,
 	 * interrupt.
 	 */
 	ret = gpiochip_irqchip_add(&at91_gpio->chip,
-				   &gpio_irqchip,
+				   gpio_irqchip,
 				   0,
 				   handle_edge_irq,
 				   IRQ_TYPE_EDGE_BOTH);
@@ -1642,7 +1642,7 @@ static int at91_gpio_of_irq_setup(struct platform_device *pdev,
 	if (!gpiochip_prev) {
 		/* Then register the chain on the parent IRQ */
 		gpiochip_set_chained_irqchip(&at91_gpio->chip,
-					     &gpio_irqchip,
+					     gpio_irqchip,
 					     at91_gpio->pioc_virq,
 					     gpio_irq_handler);
 		return 0;
-- 
2.20.1