I have a WRT160NL router with OpenWrt Backfire (10.03.1, r29592), and there is a 3,5 WD Green 1,5TB HDD attached to it. In the recent time if I read the logs on it with logread I can see these messages: Dec 12 17:07:16 OWRTROUTER user.err kernel: ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00024020Dec 12 17:07:16 OWRTROUTER user.err kernel: ath: Could not stop RX, we could be confusing the DMA engine when we start RX upDec 12 17:07:16 OWRTROUTER user.err kernel: ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00024020Dec 12 17:07:16 OWRTROUTER user.err kernel: ath: Could not stop RX, we could be confusing the DMA engine when we start RX upDec 12 17:07:17 OWRTROUTER user.err kernel: ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00024020Dec 12 17:07:17 OWRTROUTER user.err kernel: ath: Could not stop RX, we could be confusing the DMA engine when we start RX upWhat are these messages? Are there a sign of a future problem? How to handle them?
DMA errors on OpenWrt router
openwrt
ath would be your wireless card (or at least one of them). Probably a  bug in the driver for it.  derobert Dec 13 '12 at 21:52So the solution is to wait for updated firmware. 