forked from Minki/linux
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: Fabio Baltieri <fabio.baltieri@gmail.com> Cc: Kurt Van Dijck <kurt.van.dijck@eia.be> Signed-off-by: Bryan Wu <cooloney@gmail.com>
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@ -166,6 +166,19 @@ void led_trigger_set_default(struct led_classdev *led_cdev)
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}
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EXPORT_SYMBOL_GPL(led_trigger_set_default);
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void led_trigger_rename_static(const char *name, struct led_trigger *trig)
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{
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/* new name must be on a temporary string to prevent races */
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BUG_ON(name == trig->name);
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down_write(&triggers_list_lock);
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/* this assumes that trig->name was originaly allocated to
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* non constant storage */
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strcpy((char *)trig->name, name);
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up_write(&triggers_list_lock);
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}
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EXPORT_SYMBOL_GPL(led_trigger_rename_static);
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/* LED Trigger Interface */
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int led_trigger_register(struct led_trigger *trig)
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@ -139,6 +139,24 @@ extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
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extern void led_set_brightness(struct led_classdev *led_cdev,
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enum led_brightness brightness);
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/**
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* led_trigger_rename_static - rename a trigger
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* @name: the new trigger name
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* @trig: the LED trigger to rename
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*
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* Change a LED trigger name by copying the string passed in
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* name into current trigger name, which MUST be large
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* enough for the new string.
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*
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* Note that name must NOT point to the same string used
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* during LED registration, as that could lead to races.
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*
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* This is meant to be used on triggers with statically
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* allocated name.
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*/
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extern void led_trigger_rename_static(const char *name,
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struct led_trigger *trig);
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/*
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* LED Triggers
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*/
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