5.15-stable review patch. If anyone has any objections, please let me know.
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From: Marek Behún kabel@kernel.org
[ Upstream commit 760b6b7925bf09491aafa4727eef74fc6bf738b0 ]
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 Stable-dep-of: 6de283b96b31 ("leds: turris-omnia: Do not use SMBUS calls") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/leds/leds-turris-omnia.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-)
diff --git a/drivers/leds/leds-turris-omnia.c b/drivers/leds/leds-turris-omnia.c index 1adfed1c0619b..c9e7c467e5acd 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);