mirror of https://gitee.com/openkylin/linux.git
rfkill: fix led-trigger unregister order in error unwind
rfkill needs to unregister the led trigger AFTER a call to rfkill_remove_switch(), otherwise it will not update the LED state, possibly leaving it ON when it should be OFF. To make led-trigger unregistering safer, guard against unregistering a trigger twice, and also against issuing trigger events to a led trigger that was unregistered. This makes the error unwind paths more resilient. Refer to "rfkill: Register LED triggers before registering switch". Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Acked-by: Ivo van Doorn <IvDoorn@gmail.com> Cc: Michael Buesch <mb@bu3sch.de> Cc: Dmitry Baryshkov <dbaryshkov@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -590,8 +590,10 @@ static void rfkill_led_trigger_register(struct rfkill *rfkill)
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static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
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{
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#ifdef CONFIG_RFKILL_LEDS
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if (rfkill->led_trigger.name)
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if (rfkill->led_trigger.name) {
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led_trigger_unregister(&rfkill->led_trigger);
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rfkill->led_trigger.name = NULL;
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}
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#endif
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}
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@ -627,8 +629,8 @@ int rfkill_register(struct rfkill *rfkill)
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error = device_add(dev);
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if (error) {
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rfkill_led_trigger_unregister(rfkill);
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rfkill_remove_switch(rfkill);
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rfkill_led_trigger_unregister(rfkill);
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return error;
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}
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