diff options
| author | John Crispin <john@openwrt.org> | 2016-03-20 14:41:25 +0000 |
|---|---|---|
| committer | John Crispin <john@openwrt.org> | 2016-03-20 14:41:25 +0000 |
| commit | b64f159bc8d94d5554792f46aacdad4d5bf643ca (patch) | |
| tree | bcb9b5b2226f4159322e53321005e30267730056 | |
| parent | daf7ab04ba0f9ee7b9ad053879a4e4eb06d653a7 (diff) | |
| download | mtk-20170518-b64f159bc8d94d5554792f46aacdad4d5bf643ca.zip mtk-20170518-b64f159bc8d94d5554792f46aacdad4d5bf643ca.tar.gz mtk-20170518-b64f159bc8d94d5554792f46aacdad4d5bf643ca.tar.bz2 | |
oxnas: add spinlock in pinctrl driver
Try to address a race-condition in pinctrl-oxnas.c
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
SVN-Revision: 49043
| -rw-r--r-- | target/linux/oxnas/files/drivers/pinctrl/pinctrl-oxnas.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/target/linux/oxnas/files/drivers/pinctrl/pinctrl-oxnas.c b/target/linux/oxnas/files/drivers/pinctrl/pinctrl-oxnas.c index aa76f40..034a730 100644 --- a/target/linux/oxnas/files/drivers/pinctrl/pinctrl-oxnas.c +++ b/target/linux/oxnas/files/drivers/pinctrl/pinctrl-oxnas.c @@ -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; + + if (!(type & IRQ_TYPE_EDGE_BOTH)) + return; - /* FIXME: need proper lock */ + 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); |