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leds: turris-omnia: Drop unnecessary mutex locking

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[ Upstream commit 760b6b7925 ]

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: 089381b27a ("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>
Stable-dep-of: 6de283b96b ("leds: turris-omnia: Do not use SMBUS calls")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marek Behún 2023-08-02 18:07:43 +02:00 committed by Greg Kroah-Hartman
parent c9a4f13c58
commit aec3706971
1 changed files with 1 additions and 10 deletions
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11
drivers/leds/leds-turris-omnia.c
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@ -156,12 +156,9 @@ static ssize_t brightness_show(struct device *dev, struct device_attribute *a,
char *buf) char *buf)
{ {
struct i2c_client *client = to_i2c_client(dev); struct i2c_client *client = to_i2c_client(dev);
struct omnia_leds *leds = i2c_get_clientdata(client);
int ret; int ret;
mutex_lock(&leds->lock);
ret = i2c_smbus_read_byte_data(client, CMD_LED_GET_BRIGHTNESS); ret = i2c_smbus_read_byte_data(client, CMD_LED_GET_BRIGHTNESS);
mutex_unlock(&leds->lock);
if (ret < 0) if (ret < 0)
return ret; return ret;
@ -173,7 +170,6 @@ static ssize_t brightness_store(struct device *dev, struct device_attribute *a,
const char *buf, size_t count) const char *buf, size_t count)
{ {
struct i2c_client *client = to_i2c_client(dev); struct i2c_client *client = to_i2c_client(dev);
struct omnia_leds *leds = i2c_get_clientdata(client);
unsigned long brightness; unsigned long brightness;
int ret; int ret;
@ -183,15 +179,10 @@ static ssize_t brightness_store(struct device *dev, struct device_attribute *a,
if (brightness > 100) if (brightness > 100)
return -EINVAL; return -EINVAL;
mutex_lock(&leds->lock);
ret = i2c_smbus_write_byte_data(client, CMD_LED_SET_BRIGHTNESS, ret = i2c_smbus_write_byte_data(client, CMD_LED_SET_BRIGHTNESS,
(u8)brightness); (u8)brightness);
mutex_unlock(&leds->lock);
if (ret < 0) return ret < 0 ? ret : count;
return ret;
return count;
} }
static DEVICE_ATTR_RW(brightness); static DEVICE_ATTR_RW(brightness);