A patch which works around the issue is included in compat wireless.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15120 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/mac80211/patches/510-b43-mask-phyerr-irq.patch

@@ -1,24 +0,0 @@
-Subject: b43: Mask the PHY TX error interrupt
-
-Mask the PHY TX error interrupt. This error triggers for yet unknown
-reasons. It's not that often to really harm the transmission, but it _might_
-be more often than 1000 times in 15 seconds. The PHY TX error watchdog however
-will reset the controller, if it triggers more than 1000 times in 15 seconds.
-This might happen under heavy load and thus kill the interface.
-
-So as a workaround we ignore the PHY TX error.
-
-
---mb
-
-
---- a/drivers/net/wireless/b43/b43.h
-+++ b/drivers/net/wireless/b43/b43.h
-@@ -422,7 +422,6 @@ enum {
- 					 B43_IRQ_ATIM_END | \
- 					 B43_IRQ_PMQ | \
- 					 B43_IRQ_MAC_TXERR | \
--					 B43_IRQ_PHY_TXERR | \
- 					 B43_IRQ_DMA | \
- 					 B43_IRQ_TXFIFO_FLUSH_OK | \
- 					 B43_IRQ_NOISESAMPLE_OK | \