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gpiolib: sysfs: Move sysfs_emit() calls outside of the mutex lock

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In a few places we perform sysfs_emit() operations under mutex that
do not require any locking. Move them outside of the mutex locks.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
This commit is contained in:
Andy Shevchenko 2022-02-09 13:31:15 +02:00 committed by Bartosz Golaszewski
parent 4398693a9e
commit e28747da77
1 changed files with 14 additions and 15 deletions
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29
drivers/gpio/gpiolib-sysfs.c
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@ -61,17 +61,16 @@ static ssize_t direction_show(struct device *dev,
{
struct gpiod_data *data = dev_get_drvdata(dev);
struct gpio_desc *desc = data->desc;
ssize_t status;
int value;
mutex_lock(&data->mutex);
gpiod_get_direction(desc);
status = sysfs_emit(buf, "%s\n",
test_bit(FLAG_IS_OUT, &desc->flags) ? "out" : "in");
value = !!test_bit(FLAG_IS_OUT, &desc->flags);
mutex_unlock(&data->mutex);
return status;
return sysfs_emit(buf, "%s\n", value ? "out" : "in");
}
static ssize_t direction_store(struct device *dev,
@ -108,12 +107,13 @@ static ssize_t value_show(struct device *dev,
mutex_lock(&data->mutex);
status = gpiod_get_value_cansleep(desc);
if (status >= 0)
status = sysfs_emit(buf, "%zd\n", status);
mutex_unlock(&data->mutex);
return status;
if (status < 0)
return status;
return sysfs_emit(buf, "%zd\n", status);
}
static ssize_t value_store(struct device *dev,
@ -238,7 +238,6 @@ static ssize_t edge_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gpiod_data *data = dev_get_drvdata(dev);
ssize_t status = 0;
int i;
mutex_lock(&data->mutex);
@ -247,12 +246,13 @@ static ssize_t edge_show(struct device *dev,
if (data->irq_flags == trigger_types[i].flags)
break;
}
if (i < ARRAY_SIZE(trigger_types))
status = sysfs_emit(buf, "%s\n", trigger_types[i].name);
mutex_unlock(&data->mutex);
return status;
if (i >= ARRAY_SIZE(trigger_types))
return 0;
return sysfs_emit(buf, "%s\n", trigger_types[i].name);
}
static ssize_t edge_store(struct device *dev,
@ -324,16 +324,15 @@ static ssize_t active_low_show(struct device *dev,
{
struct gpiod_data *data = dev_get_drvdata(dev);
struct gpio_desc *desc = data->desc;
ssize_t status;
int value;
mutex_lock(&data->mutex);
status = sysfs_emit(buf, "%d\n",
!!test_bit(FLAG_ACTIVE_LOW, &desc->flags));
value = !!test_bit(FLAG_ACTIVE_LOW, &desc->flags);
mutex_unlock(&data->mutex);
return status;
return sysfs_emit(buf, "%d\n", value);
}
static ssize_t active_low_store(struct device *dev,