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b43: Don't abuse wl->current_dev in the led work 

Don't abuse wl->current_dev in the LED work for checking whether we're
going down. Add an explicit variable.
This fixes a crash on rmmod dereferencing the wl->current_dev NULL pointer
in various other places of the driver.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Michael Buesch 2009-09-14 23:22:08 +02:00 committed by John W. Linville
parent 9308779aad
commit e899a3f232
3 changed files with 5 additions and 5 deletions
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7
drivers/net/wireless/b43/leds.c
View File

@ -112,10 +112,7 @@ static void b43_led_brightness_set(struct led_classdev *led_dev,
struct b43_led *led = container_of(led_dev, struct b43_led, led_dev);
struct b43_wl *wl = led->wl;
/* The check for current_dev is only needed while unregistering,
* so it is sequencial and does not race. But we must not dereference
* current_dev here. */
if (likely(wl->current_dev)) {
if (likely(!wl->leds.stop)) {
atomic_set(&led->state, brightness);
ieee80211_queue_work(wl->hw, &wl->leds.work);
}
@ -314,6 +311,8 @@ void b43_leds_init(struct b43_wldev *dev)
break;
}
}
dev->wl->leds.stop = 0;
}
void b43_leds_exit(struct b43_wldev *dev)

1
drivers/net/wireless/b43/leds.h
View File

@ -35,6 +35,7 @@ struct b43_leds {
struct b43_led led_radio;
struct b43_led led_assoc;
bool stop;
struct work_struct work;
};

2
drivers/net/wireless/b43/main.c
View File

@ -4987,7 +4987,7 @@ static void b43_remove(struct ssb_device *dev)
* might have modified it. Restoring is important, so the networking
* stack can properly free resources. */
wl->hw->queues = wl->mac80211_initially_registered_queues;
wl->current_dev = NULL;
wl->leds.stop = 1;
cancel_work_sync(&wl->leds.work);
ieee80211_unregister_hw(wl->hw);
}