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leds: add led_trigger_rename function

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Implements a "led_trigger_rename" function to rename a trigger with
proper locking.

This assumes that led name was originally allocated in non-constant
storage.

Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com>
Cc: Kurt Van Dijck <kurt.van.dijck@eia.be>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Fabio Baltieri 2012-11-04 01:54:34 -08:00 committed by Bryan Wu
parent 5cce0105c8
commit a8df7b1ab7
2 changed files with 31 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

13
drivers/leds/led-triggers.c
View file

@ -166,6 +166,19 @@ void led_trigger_set_default(struct led_classdev *led_cdev)
} }
EXPORT_SYMBOL_GPL(led_trigger_set_default); EXPORT_SYMBOL_GPL(led_trigger_set_default);
void led_trigger_rename_static(const char *name, struct led_trigger *trig)
{
/* new name must be on a temporary string to prevent races */
BUG_ON(name == trig->name);
down_write(&triggers_list_lock);
/* this assumes that trig->name was originaly allocated to
* non constant storage */
strcpy((char *)trig->name, name);
up_write(&triggers_list_lock);
}
EXPORT_SYMBOL_GPL(led_trigger_rename_static);
/* LED Trigger Interface */ /* LED Trigger Interface */
int led_trigger_register(struct led_trigger *trig) int led_trigger_register(struct led_trigger *trig)

18
include/linux/leds.h
View file

@ -139,6 +139,24 @@ extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
extern void led_set_brightness(struct led_classdev *led_cdev, extern void led_set_brightness(struct led_classdev *led_cdev,
enum led_brightness brightness); enum led_brightness brightness);
/**
* led_trigger_rename_static - rename a trigger
* @name: the new trigger name
* @trig: the LED trigger to rename
*
* Change a LED trigger name by copying the string passed in
* name into current trigger name, which MUST be large
* enough for the new string.
*
* Note that name must NOT point to the same string used
* during LED registration, as that could lead to races.
*
* This is meant to be used on triggers with statically
* allocated name.
*/
extern void led_trigger_rename_static(const char *name,
struct led_trigger *trig);
/* /*
* LED Triggers * LED Triggers
*/ */