diff -ru linux-2.6.24.1-orig/drivers/net/wireless/b43/main.c linux-2.6.24.3/drivers/net/wireless/b43/main.c
--- linux-2.6.24.1-orig/drivers/net/wireless/b43/main.c	2008-03-22 19:50:37.000000000 +0100
+++ linux-2.6.24.3/drivers/net/wireless/b43/main.c	2008-03-22 19:44:26.000000000 +0100
@@ -2515,6 +2515,11 @@
 		goto out;
 	if (unlikely(b43_status(dev) < B43_STAT_STARTED))
 		goto out;
+
+	if (ctl->type == IEEE80211_IF_TYPE_MNTR) {
+		ctl->flags |= IEEE80211_TXCTL_NO_ACK;
+	}
+
 	/* DMA-TX is done without a global lock. */
 	if (b43_using_pio(dev)) {
 		spin_lock_irqsave(&wl->irq_lock, flags);
diff -ru linux-2.6.24.1-orig/drivers/net/wireless/b43legacy/main.c linux-2.6.24.3/drivers/net/wireless/b43legacy/main.c
--- linux-2.6.24.1-orig/drivers/net/wireless/b43legacy/main.c	2008-03-22 19:50:37.000000000 +0100
+++ linux-2.6.24.3/drivers/net/wireless/b43legacy/main.c	2008-03-22 19:47:00.000000000 +0100
@@ -2379,6 +2379,11 @@
 		goto out;
 	if (unlikely(b43legacy_status(dev) < B43legacy_STAT_STARTED))
 		goto out;
+
+	if (ctl->type == IEEE80211_IF_TYPE_MNTR) {
+		ctl->flags |= IEEE80211_TXCTL_NO_ACK;
+	}
+
 	/* DMA-TX is done without a global lock. */
 	if (b43legacy_using_pio(dev)) {
 		spin_lock_irqsave(&wl->irq_lock, flags);