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leds: core: avoid error message when a USB LED device is unplugged

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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>
This commit is contained in:
Heiner Kallweit
2016-01-22 21:43:48 +01:00
committed by Jacek Anaszewski
parent 70b2563b35
commit d84d80f38f
3 changed files with 8 additions and 1 deletions
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2
include/linux/leds.h
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@@ -39,6 +39,7 @@ struct led_classdev {
/* Lower 16 bits reflect status */
#define LED_SUSPENDED (1 << 0)
#define LED_UNREGISTERING (1 << 1)
/* Upper 16 bits reflect control information */
#define LED_CORE_SUSPENDRESUME (1 << 16)
#define LED_BLINK_ONESHOT (1 << 17)
@@ -48,6 +49,7 @@ struct led_classdev {
#define LED_BLINK_DISABLE (1 << 21)
#define LED_SYSFS_DISABLE (1 << 22)
#define LED_DEV_CAP_FLASH (1 << 23)
#define LED_HW_PLUGGABLE (1 << 24)
/* Set LED brightness level
* Must not sleep. Use brightness_set_blocking for drivers