[PATCH 2/2] mac80211: Make un-found-rate splat a warn-once.

[greearb@candelatech.com]

From: Ben Greear <greearb@candelatech.com>

After that, print it out with net_ratelimit.  We saw a system
continually hit this warning, for reasons unknown, and it
seems it bogged the system down enough to make it go OOM.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
:100644 100644 e03a8e9... 2eab7d8... M	net/mac80211/tx.c
 net/mac80211/tx.c |   26 +++++++++++++++++++-------
 1 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index e03a8e9..2eab7d8 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -672,14 +672,26 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
 	 * Lets not bother rate control if we're associated and cannot
 	 * talk to the sta. This should not happen.
 	 */
-	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
-		 !rate_usable_index_exists(sband, &tx->sta->sta),
-		 "%s: Dropped data frame as no usable bitrate found while "
-		 "scanning and associated. Target station: "
-		 "%pM on %d GHz band\n",
-		 tx->sdata->name, hdr->addr1,
-		 info->band ? 5 : 2))
+	if (test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
+	    !rate_usable_index_exists(sband, &tx->sta->sta)) {
+		static bool do_once = true;
+		if (do_once) {
+			WARN(1, "%s: Dropped data frame as no usable bitrate found while "
+			     "scanning and associated. Target station: "
+			     "%pM on %d GHz band\n",
+			     tx->sdata->name, hdr->addr1,
+			     info->band ? 5 : 2);
+			do_once = false;
+		}
+		else {
+			net_info_ratelimited("%s: Dropped data frame as no usable bitrate found while "
+					     "scanning and associated. Target station: "
+					     "%pM on %d GHz band\n",
+					     tx->sdata->name, hdr->addr1,
+					     info->band ? 5 : 2);
+		}
 		return TX_DROP;
+	}
 
 	/*
 	 * If we're associated with the sta at this point we know we can at
-- 
1.7.3.4