lkml.org 
[lkml]   [2015]   [Apr]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 15/23] gpio: sysfs: only call irq helper if needed
Date
Only call irq helper if actually reconfiguring interrupt state.

This is a preparatory step in introducing separate gpio-irq request and
free functions.

Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/gpio/gpiolib-sysfs.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index 8041c1728231..bd22de806182 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;
@@ -225,6 +222,9 @@ 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;

@@ -234,12 +234,20 @@ 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;
@@ -675,7 +683,8 @@ 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);
}
--
2.0.5


\
 
 \ /
  Last update: 2015-04-21 18:01    [W:0.291 / U:0.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site