From: Christian Lamparter Date: Mon, 1 Jun 2009 20:49:25 +0000 (+0200) Subject: ar9170: cancel led worker properly on exit X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6d7db193f2097d2f12fdc6b2300439a91a3196be;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git ar9170: cancel led worker properly on exit "[PATCH 3/4 v2] ar9170: fix LED power state handling" revealed a bug which can cause a ugly crash. The delayed worker is canceled before the LED class functions are unregistered... So, if something manages to update the LEDs while unregister routine is running the timer could fire _after_ the module has been unloaded. Signed-off-by: Christian Lamparter Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/ath/ar9170/led.c b/drivers/net/wireless/ath/ar9170/led.c index 3c8a5728920..63fda6cd210 100644 --- a/drivers/net/wireless/ath/ar9170/led.c +++ b/drivers/net/wireless/ath/ar9170/led.c @@ -74,7 +74,7 @@ static void ar9170_update_leds(struct work_struct *work) mutex_lock(&ar->mutex); for (i = 0; i < AR9170_NUM_LEDS; i++) - if (ar->leds[i].toggled) { + if (ar->leds[i].registered && ar->leds[i].toggled) { led_val |= 1 << i; tmp = 70 + 200 / (ar->leds[i].toggled); @@ -101,6 +101,9 @@ static void ar9170_led_brightness_set(struct led_classdev *led, struct ar9170_led *arl = container_of(led, struct ar9170_led, l); struct ar9170 *ar = arl->ar; + if (unlikely(!arl->registered)) + return ; + if (arl->last_state != !!brightness) { arl->toggled++; arl->last_state = !!brightness; @@ -139,13 +142,14 @@ void ar9170_unregister_leds(struct ar9170 *ar) { int i; - cancel_delayed_work_sync(&ar->led_work); - for (i = 0; i < AR9170_NUM_LEDS; i++) if (ar->leds[i].registered) { led_classdev_unregister(&ar->leds[i].l); ar->leds[i].registered = false; + ar->leds[i].toggled = 0; } + + cancel_delayed_work_sync(&ar->led_work); } int ar9170_register_leds(struct ar9170 *ar)