diff options
| author | Heiner Kallweit <hkallweit1@gmail.com> | 2016-01-22 23:43:48 +0300 |
|---|---|---|
| committer | Jacek Anaszewski <j.anaszewski@samsung.com> | 2016-03-14 11:22:20 +0300 |
| commit | d84d80f38f0ff4eb4becf1a3569c8e7b2c463b61 (patch) | |
| tree | 6a856df3aff0c9611a666faca10079960a1480f2 /drivers/leds | |
| parent | 70b2563b35b3edcf67819b99e560f3f0f6ce4a9f (diff) | |
| download | linux-d84d80f38f0ff4eb4becf1a3569c8e7b2c463b61.tar.xz | |
leds: core: avoid error message when a USB LED device is unplugged
When a USB LED device is unplugged the remove call chain calls
led_classdev_unregister which tries to switch the LED off.
As the device has been removed already this results in a ENODEV
error message in dmesg.
Avoid this error message by ignoring ENODEV in calls from
led_classdev_unregister if the LED device is flagged as pluggable.
Therefore a new flag LED_HW_PLUGGABLE was introduced which should be set by
all LED drivers handling pluggable LED devices (mainly USB LED devices).
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/led-class.c | 2 | ||||
| -rw-r--r-- | drivers/leds/led-core.c | 5 |
2 files changed, 6 insertions, 1 deletions
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index 14139c337312..aa84e5b37593 100644 --- a/drivers/leds/led-class.c +++ b/drivers/leds/led-class.c @@ -245,6 +245,8 @@ void led_classdev_unregister(struct led_classdev *led_cdev) up_write(&led_cdev->trigger_lock); #endif + led_cdev->flags |= LED_UNREGISTERING; + /* Stop blinking */ led_stop_software_blink(led_cdev); diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c index 19e1e60dfaa3..ad684b6d0b72 100644 --- a/drivers/leds/led-core.c +++ b/drivers/leds/led-core.c @@ -98,7 +98,10 @@ static void set_brightness_delayed(struct work_struct *ws) led_cdev->delayed_set_value); else ret = -ENOTSUPP; - if (ret < 0) + if (ret < 0 && + /* LED HW might have been unplugged, therefore don't warn */ + !(ret == -ENODEV && (led_cdev->flags & LED_UNREGISTERING) && + (led_cdev->flags & LED_HW_PLUGGABLE))) dev_err(led_cdev->dev, "Setting an LED's brightness failed (%d)\n", ret); } |