ath9k: Make DMA warning in ath_stoprecv WARN_ON_ONCE.

This decreases spammage in the log.  A single line message
will still be printed, so users can be aware that problem
exists.
Signed-off-by: Ben Greear <greearb@candelatech.com>
Acked-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath.h

@@ -267,6 +267,7 @@ enum ATH_DEBUG {
 	rtn;							\
 })
 #define ATH_DBG_WARN(foo, arg...) WARN(foo, arg)
+#define ATH_DBG_WARN_ON_ONCE(foo) WARN_ON_ONCE(foo)
 
 #else
 
@@ -277,6 +278,7 @@ ath_dbg(struct ath_common *common, enum ATH_DEBUG dbg_mask,
 	return 0;
 }
 #define ATH_DBG_WARN(foo, arg...) do {} while (0)
+#define ATH_DBG_WARN_ON_ONCE(foo) do {} while (0)
 
 #endif /* CONFIG_ATH_DEBUG */
 

drivers/net/wireless/ath/ath9k/recv.c

@@ -528,8 +528,12 @@ bool ath_stoprecv(struct ath_softc *sc)
 		sc->rx.rxlink = NULL;
 	spin_unlock_bh(&sc->rx.rxbuflock);
 
-	ATH_DBG_WARN(!stopped, "Could not stop RX, we could be "
+	if (unlikely(!stopped)) {
+		ath_err(ath9k_hw_common(sc->sc_ah),
+			"Could not stop RX, we could be "
 			"confusing the DMA engine when we start RX up\n");
+		ATH_DBG_WARN_ON_ONCE(!stopped);
+	}
 	return stopped;
 }