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Commit a8df7b1a authored by Fabio Baltieri's avatar Fabio Baltieri Committed by Bryan Wu
Browse files

leds: add led_trigger_rename function 



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: default avatarFabio Baltieri <fabio.baltieri@gmail.com>
Cc: Kurt Van Dijck <kurt.van.dijck@eia.be>
Signed-off-by: default avatarBryan Wu <cooloney@gmail.com>
parent 5cce0105

drivers/leds/led-triggers.c

+13 −0
Original line number Diff line number Diff line
@@ -166,6 +166,19 @@ void led_trigger_set_default(struct led_classdev *led_cdev) 
}

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 */



int led_trigger_register(struct led_trigger *trig)

include/linux/leds.h

+18 −0
Original line number Diff line number Diff line
@@ -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,

			       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

 */