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b43: Fix possible MMIO access while device is down

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This fixes a possible MMIO access while the device is still down
from a suspend cycle. MMIO accesses with the device powered down
may cause crashes on certain devices.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Michael Buesch 2008-06-15 16:01:24 +02:00 committed by John W. Linville
parent 664f200610
commit 7b3abfc87e
1 changed files with 3 additions and 0 deletions
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drivers/net/wireless/b43/leds.c
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@ -72,6 +72,9 @@ static void b43_led_brightness_set(struct led_classdev *led_dev,
struct b43_wldev *dev = led->dev;
bool radio_enabled;
if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED))
return;
/* Checking the radio-enabled status here is slightly racy,
* but we want to avoid the locking overhead and we don't care
* whether the LED has the wrong state for a second. */