diff options
| author | Marek Behún <kabel@kernel.org> | 2023-08-02 19:07:43 +0300 |
|---|---|---|
| committer | Lee Jones <lee@kernel.org> | 2023-08-18 12:18:35 +0300 |
| commit | 760b6b7925bf09491aafa4727eef74fc6bf738b0 (patch) | |
| tree | 17fad30db987c7a4d852a791d422f41061a1c122 /drivers/leds/leds-turris-omnia.c | |
| parent | 72a29725b6f2577fa447ca9059cdcd17100043b4 (diff) | |
| download | linux-760b6b7925bf09491aafa4727eef74fc6bf738b0.tar.xz | |
leds: turris-omnia: Drop unnecessary mutex locking
Do not lock driver mutex in the global LED panel brightness sysfs
accessors brightness_show() and brightness_store().
The mutex locking is unnecessary here. The I2C transfers are guarded by
I2C core locking mechanism, and the LED commands itself do not interfere
with other commands.
Fixes: 089381b27abe ("leds: initial support for Turris Omnia LEDs")
Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230802160748.11208-2-kabel@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>
Diffstat (limited to 'drivers/leds/leds-turris-omnia.c')
| -rw-r--r-- | drivers/leds/leds-turris-omnia.c | 11 |
1 files changed, 1 insertions, 10 deletions
diff --git a/drivers/leds/leds-turris-omnia.c b/drivers/leds/leds-turris-omnia.c index ffcaf228e44a..b8a95a917cfa 100644 --- a/drivers/leds/leds-turris-omnia.c +++ b/drivers/leds/leds-turris-omnia.c @@ -156,12 +156,9 @@ static ssize_t brightness_show(struct device *dev, struct device_attribute *a, char *buf) { struct i2c_client *client = to_i2c_client(dev); - struct omnia_leds *leds = i2c_get_clientdata(client); int ret; - mutex_lock(&leds->lock); ret = i2c_smbus_read_byte_data(client, CMD_LED_GET_BRIGHTNESS); - mutex_unlock(&leds->lock); if (ret < 0) return ret; @@ -173,7 +170,6 @@ static ssize_t brightness_store(struct device *dev, struct device_attribute *a, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); - struct omnia_leds *leds = i2c_get_clientdata(client); unsigned long brightness; int ret; @@ -183,15 +179,10 @@ static ssize_t brightness_store(struct device *dev, struct device_attribute *a, if (brightness > 100) return -EINVAL; - mutex_lock(&leds->lock); ret = i2c_smbus_write_byte_data(client, CMD_LED_SET_BRIGHTNESS, (u8)brightness); - mutex_unlock(&leds->lock); - - if (ret < 0) - return ret; - return count; + return ret < 0 ? ret : count; } static DEVICE_ATTR_RW(brightness); |