ath: Add support for tracing

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h
index a3b6e27..e5ba6fa 100644
--- a/drivers/net/wireless/ath/ath.h
+++ b/drivers/net/wireless/ath/ath.h
@@ -268,6 +268,7 @@
 };
 
 #define ATH_DBG_DEFAULT (ATH_DBG_FATAL)
+#define ATH_DBG_MAX_LEN 512
 
 #ifdef CONFIG_ATH_DEBUG