diff options
| -rw-r--r-- | drivers/gpio/gpiolib-sysfs.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c index bccba406fc22..201b757ad0db 100644 --- a/drivers/gpio/gpiolib-sysfs.c +++ b/drivers/gpio/gpiolib-sysfs.c @@ -139,9 +139,6 @@ static int gpio_setup_irq(struct device *dev, unsigned long gpio_flags) unsigned long irq_flags; int ret, irq; - if ((desc->flags & GPIO_TRIGGER_MASK) == gpio_flags) - return 0; - irq = gpiod_to_irq(desc); if (irq < 0) return -EIO; @@ -240,6 +237,9 @@ static ssize_t edge_show(struct device *dev, static ssize_t edge_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { + struct gpiod_data *data = dev_get_drvdata(dev); + struct gpio_desc *desc = data->desc; + unsigned long flags; ssize_t status; int i; @@ -249,12 +249,20 @@ static ssize_t edge_store(struct device *dev, return -EINVAL; found: + flags = trigger_types[i].flags; + mutex_lock(&sysfs_lock); - status = gpio_setup_irq(dev, trigger_types[i].flags); + if ((desc->flags & GPIO_TRIGGER_MASK) == flags) { + status = size; + goto out_unlock; + } + + status = gpio_setup_irq(dev, flags); if (!status) status = size; +out_unlock: mutex_unlock(&sysfs_lock); return status; @@ -690,7 +698,8 @@ void gpiod_unexport(struct gpio_desc *desc) * Release irq after deregistration to prevent race with * edge_store. */ - gpio_setup_irq(dev, 0); + if (desc->flags & GPIO_TRIGGER_MASK) + gpio_setup_irq(dev, 0); put_device(dev); kfree(data); } |