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oxnas: add spinlock in pinctrl driver

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Try to address a race-condition in pinctrl-oxnas.c

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

SVN-Revision: 49043
This commit is contained in:
John Crispin 2016-03-20 14:41:25 +00:00
parent daf7ab04ba
commit b64f159bc8
1 changed files with 16 additions and 2 deletions
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18
target/linux/oxnas/files/drivers/pinctrl/pinctrl-oxnas.c
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@ -26,6 +26,7 @@
#include <linux/pinctrl/pinmux.h>
/* Since we request GPIOs from ourself */
#include <linux/pinctrl/consumer.h>
#include <linux/spinlock.h>
#include <linux/version.h>
#include "core.h"
@ -41,6 +42,7 @@ struct oxnas_gpio_chip {
void __iomem *regbase; /* GPIOA/B virtual address */
void __iomem *ctrlbase; /* SYS/SEC_CTRL virtual address */
struct irq_domain *domain; /* associated irq domain */
spinlock_t lock;
};
#define to_oxnas_gpio_chip(c) container_of(c, struct oxnas_gpio_chip, chip)
@ -1145,12 +1147,17 @@ static void gpio_irq_mask(struct irq_data *d)
void __iomem *pio = oxnas_gpio->regbase;
unsigned mask = 1 << d->hwirq;
unsigned type = irqd_get_trigger_type(d);
unsigned long flags;
/* FIXME: need proper lock */
if (!(type & IRQ_TYPE_EDGE_BOTH))
return;
spin_lock_irqsave(&oxnas_gpio->lock, flags);
if (type & IRQ_TYPE_EDGE_RISING)
oxnas_register_clear_mask(pio + RE_IRQ_ENABLE, mask);
if (type & IRQ_TYPE_EDGE_FALLING)
oxnas_register_clear_mask(pio + FE_IRQ_ENABLE, mask);
spin_unlock_irqrestore(&oxnas_gpio->lock, flags);
}
static void gpio_irq_unmask(struct irq_data *d)
@ -1159,12 +1166,17 @@ static void gpio_irq_unmask(struct irq_data *d)
void __iomem *pio = oxnas_gpio->regbase;
unsigned mask = 1 << d->hwirq;
unsigned type = irqd_get_trigger_type(d);
unsigned long flags;
/* FIXME: need proper lock */
if (!(type & IRQ_TYPE_EDGE_BOTH))
return;
spin_lock_irqsave(&oxnas_gpio->lock, flags);
if (type & IRQ_TYPE_EDGE_RISING)
oxnas_register_set_mask(pio + RE_IRQ_ENABLE, mask);
if (type & IRQ_TYPE_EDGE_FALLING)
oxnas_register_set_mask(pio + FE_IRQ_ENABLE, mask);
spin_unlock_irqrestore(&oxnas_gpio->lock, flags);
}
@ -1359,6 +1371,8 @@ static int oxnas_gpio_probe(struct platform_device *pdev)
oxnas_chip->chip = oxnas_gpio_template;
spin_lock_init(&oxnas_chip->lock);
chip = &oxnas_chip->chip;
chip->of_node = np;
chip->label = dev_name(&pdev->dev);