[patch 03/47] b43: Fix possible MMIO access while device is down

[Greg KH]

2.6.25-stable review patch.  If anyone has any objections, please let us
know.

------------------
From: Michael Buesch <mb@xxxxxxxxx>

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.

Upstream commit is
33598cf261e393f2b3349cb55509e358014bfd1f

Signed-off-by: Michael Buesch <mb@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/net/wireless/b43/leds.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/wireless/b43/leds.c
+++ b/drivers/net/wireless/b43/leds.c
@@ -72,6 +72,9 @@ static void b43_led_brightness_set(struc
 	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. */

-- 
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